40642557 has 8 divisors (see below), whose sum is σ = 54586176. Its totient is φ = 26896992.

The previous prime is 40642549. The next prime is 40642571. The reversal of 40642557 is 75524604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40642557 - 2³ = 40642549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40642517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49033 + ... + 49854.

It is an arithmetic number, because the mean of its divisors is an integer number (6823272).

Almost surely, 2^40642557 is an apocalyptic number.

It is an amenable number.

40642557 is a deficient number, since it is larger than the sum of its proper divisors (13943619).

40642557 is a wasteful number, since it uses less digits than its factorization.

40642557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99027.

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 40642557 is about 6375.1515276109. The cubic root of 40642557 is about 343.8167318600.

The spelling of 40642557 in words is "forty million, six hundred forty-two thousand, five hundred fifty-seven".