1557940417 has 4 divisors (see below), whose sum is σ = 1699571376. Its totient is φ = 1416309460.

The previous prime is 1557940409. The next prime is 1557940421. The reversal of 1557940417 is 7140497551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7140497551 = 11 ⋅649136141.

It is a cyclic number.

It is not a de Polignac number, because 1557940417 - 2³ = 1557940409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1557940477) 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, 70815463 + ... + 70815484.

It is an arithmetic number, because the mean of its divisors is an integer number (424892844).

Almost surely, 2^1557940417 is an apocalyptic number.

It is an amenable number.

1557940417 is a deficient number, since it is larger than the sum of its proper divisors (141630959).

1557940417 is a wasteful number, since it uses less digits than its factorization.

1557940417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141630958.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 1557940417 is about 39470.7539451681. The cubic root of 1557940417 is about 1159.2673775151.

The spelling of 1557940417 in words is "one billion, five hundred fifty-seven million, nine hundred forty thousand, four hundred seventeen".