1405150640 has 80 divisors (see below), whose sum is σ = 3570842880. Its totient is φ = 511918080.

The previous prime is 1405150631. The next prime is 1405150673. The reversal of 1405150640 is 460515041.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25496 + ... + 58824.

It is an arithmetic number, because the mean of its divisors is an integer number (44635536).

Almost surely, 2^1405150640 is an apocalyptic number.

1405150640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1405150640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1785421440).

1405150640 is an abundant number, since it is smaller than the sum of its proper divisors (2165692240).

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

1405150640 is a wasteful number, since it uses less digits than its factorization.

1405150640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33390 (or 33384 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1405150640 is about 37485.3390007347. The cubic root of 1405150640 is about 1120.0591592901.

Adding to 1405150640 its reverse (460515041), we get a palindrome (1865665681).

The spelling of 1405150640 in words is "one billion, four hundred five million, one hundred fifty thousand, six hundred forty".