1551660 has 48 divisors (see below), whose sum is σ = 4741632. Its totient is φ = 376000.

The previous prime is 1551659. The next prime is 1551661. The reversal of 1551660 is 661551.

It is an interprime number because it is at equal distance from previous prime (1551659) and next prime (1551661).

It is a self number, because there is not a number n which added to its sum of digits gives 1551660.

It is not an unprimeable number, because it can be changed into a prime (1551661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 516 + ... + 1835.

It is an arithmetic number, because the mean of its divisors is an integer number (98784).

2^1551660 is an apocalyptic number.

1551660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551660 is an abundant number, since it is smaller than the sum of its proper divisors (3189972).

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

1551660 is a wasteful number, since it uses less digits than its factorization.

1551660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374 (or 2372 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1551660 is about 1245.6564534413. The cubic root of 1551660 is about 115.7707521566.

It can be divided in two parts, 15516 and 60, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 1551660 in words is "one million, five hundred fifty-one thousand, six hundred sixty".