409897557 has 16 divisors (see below), whose sum is σ = 642977280. Its totient is φ = 257190336.

The previous prime is 409897549. The next prime is 409897637. The reversal of 409897557 is 755798904.

409897557 is a `hidden beast` number, since 4 + 0 + 9 + 89 + 7 + 557 = 666.

It is not a de Polignac number, because 409897557 - 2³ = 409897549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409897057) 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, 446053 + ... + 446970.

It is an arithmetic number, because the mean of its divisors is an integer number (40186080).

Almost surely, 2^409897557 is an apocalyptic number.

It is an amenable number.

409897557 is a deficient number, since it is larger than the sum of its proper divisors (233079723).

409897557 is a wasteful number, since it uses less digits than its factorization.

409897557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893049 (or 893043 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 54.

The square root of 409897557 is about 20245.9269237049. The cubic root of 409897557 is about 742.8340054272.

The spelling of 409897557 in words is "four hundred nine million, eight hundred ninety-seven thousand, five hundred fifty-seven".