1656490 has 36 divisors (see below), whose sum is σ = 3368358. Its totient is φ = 586080.

The previous prime is 1656427. The next prime is 1656491. The reversal of 1656490 is 946561.

It can be written as a sum of positive squares in 3 ways, for example, as 1656369 + 121 = 1287^2 + 11^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1656491) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 44752 + ... + 44788.

2^1656490 is an apocalyptic number.

1656490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1656490 is an abundant number, since it is smaller than the sum of its proper divisors (1711868).

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

1656490 is a wasteful number, since it uses less digits than its factorization.

1656490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1656490 is about 1287.0470076885. The cubic root of 1656490 is about 118.3213018692.

It can be divided in two parts, 16 and 56490, that multiplied together give a triangular number (903840 = T₁₃₄₄).

The spelling of 1656490 in words is "one million, six hundred fifty-six thousand, four hundred ninety".