3897904491 has 32 divisors (see below), whose sum is σ = 6248471040. Its totient is φ = 2387296800.

The previous prime is 3897904489. The next prime is 3897904513. The reversal of 3897904491 is 1944097983.

3897904491 is a `hidden beast` number, since 3 + 89 + 79 + 0 + 4 + 491 = 666.

It is not a de Polignac number, because 3897904491 - 2¹ = 3897904489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3897905491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47746 + ... + 100376.

It is an arithmetic number, because the mean of its divisors is an integer number (195264720).

Almost surely, 2^3897904491 is an apocalyptic number.

3897904491 is a deficient number, since it is larger than the sum of its proper divisors (2350566549).

3897904491 is a wasteful number, since it uses less digits than its factorization.

3897904491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52864 (or 52858 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 3897904491 is about 62433.2002303262. The cubic root of 3897904491 is about 1573.7789465666.

The spelling of 3897904491 in words is "three billion, eight hundred ninety-seven million, nine hundred four thousand, four hundred ninety-one".