1640893425 has 24 divisors (see below), whose sum is σ = 2751163200. Its totient is φ = 862814400.

The previous prime is 1640893391. The next prime is 1640893477. The reversal of 1640893425 is 5243980461.

It is not a de Polignac number, because 1640893425 - 2⁸ = 1640893169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148750 + ... + 159399.

It is an arithmetic number, because the mean of its divisors is an integer number (114631800).

Almost surely, 2^1640893425 is an apocalyptic number.

1640893425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640893425 is a deficient number, since it is larger than the sum of its proper divisors (1110269775).

1640893425 is a wasteful number, since it uses less digits than its factorization.

1640893425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308233 (or 308228 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 1640893425 is about 40507.9427396653. The cubic root of 1640893425 is about 1179.4878139591.

The spelling of 1640893425 in words is "one billion, six hundred forty million, eight hundred ninety-three thousand, four hundred twenty-five".