11651970 has 128 divisors (see below), whose sum is σ = 33841152. Its totient is φ = 2534400.

The previous prime is 11651963. The next prime is 11651977. The reversal of 11651970 is 7915611.

It is an interprime number because it is at equal distance from previous prime (11651963) and next prime (11651977).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (11651977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 173877 + ... + 173943.

It is an arithmetic number, because the mean of its divisors is an integer number (264384).

Almost surely, 2^11651970 is an apocalyptic number.

11651970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11651970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16920576).

11651970 is an abundant number, since it is smaller than the sum of its proper divisors (22189182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11651970 is a wasteful number, since it uses less digits than its factorization.

11651970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136.

The product of its (nonzero) digits is 1890, while the sum is 30.

The square root of 11651970 is about 3413.4982056535. The cubic root of 11651970 is about 226.7077948245.

It can be divided in two parts, 11651 and 970, that added together give a palindrome (12621).

The spelling of 11651970 in words is "eleven million, six hundred fifty-one thousand, nine hundred seventy".