40387557 has 16 divisors (see below), whose sum is σ = 61632000. Its totient is φ = 23045232.

The previous prime is 40387553. The next prime is 40387573. The reversal of 40387557 is 75578304.

It is not a de Polignac number, because 40387557 - 2² = 40387553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40387553) 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, 26194 + ... + 27692.

It is an arithmetic number, because the mean of its divisors is an integer number (3852000).

Almost surely, 2^40387557 is an apocalyptic number.

It is an amenable number.

40387557 is a deficient number, since it is larger than the sum of its proper divisors (21244443).

40387557 is a wasteful number, since it uses less digits than its factorization.

40387557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792.

The product of its (nonzero) digits is 117600, while the sum is 39.

The square root of 40387557 is about 6355.1205338687. The cubic root of 40387557 is about 343.0961631168.

The spelling of 40387557 in words is "forty million, three hundred eighty-seven thousand, five hundred fifty-seven".