40851557 has 4 divisors (see below), whose sum is σ = 41111916. Its totient is φ = 40591200.

The previous prime is 40851533. The next prime is 40851563. The reversal of 40851557 is 75515804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23951236 + 16900321 = 4894^2 + 4111^2 .

It is a cyclic number.

It is not a de Polignac number, because 40851557 - 2¹⁰ = 40850533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40851257) 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, 129944 + ... + 130257.

It is an arithmetic number, because the mean of its divisors is an integer number (10277979).

Almost surely, 2^40851557 is an apocalyptic number.

It is an amenable number.

40851557 is a deficient number, since it is larger than the sum of its proper divisors (260359).

40851557 is a wasteful number, since it uses less digits than its factorization.

40851557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260358.

The product of its (nonzero) digits is 28000, while the sum is 35.

The square root of 40851557 is about 6391.5222756398. The cubic root of 40851557 is about 344.4050714351.

The spelling of 40851557 in words is "forty million, eight hundred fifty-one thousand, five hundred fifty-seven".