1656039380 has 12 divisors (see below), whose sum is σ = 3477682740. Its totient is φ = 662415744.

The previous prime is 1656039367. The next prime is 1656039389. The reversal of 1656039380 is 839306561.

It can be written as a sum of positive squares in 2 ways, for example, as 1281926416 + 374112964 = 35804^2 + 19342^2 .

It is a super-2 number, since 2×1656039380² = 5484932856221568800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656039389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41400965 + ... + 41401004.

It is an arithmetic number, because the mean of its divisors is an integer number (289806895).

Almost surely, 2^1656039380 is an apocalyptic number.

1656039380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656039380 is an abundant number, since it is smaller than the sum of its proper divisors (1821643360).

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

1656039380 is a wasteful number, since it uses less digits than its factorization.

1656039380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82801978 (or 82801976 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 1656039380 is about 40694.4637512279. The cubic root of 1656039380 is about 1183.1057179523.

The spelling of 1656039380 in words is "one billion, six hundred fifty-six million, thirty-nine thousand, three hundred eighty".