40081157 has 4 divisors (see below), whose sum is σ = 41823840. Its totient is φ = 38338476.

The previous prime is 40081147. The next prime is 40081193. The reversal of 40081157 is 75118004.

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.

It is a cyclic number.

It is not a de Polignac number, because 40081157 - 2⁴ = 40081141 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 (40081147) 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, 871307 + ... + 871352.

It is an arithmetic number, because the mean of its divisors is an integer number (10455960).

Almost surely, 2^40081157 is an apocalyptic number.

It is an amenable number.

40081157 is a deficient number, since it is larger than the sum of its proper divisors (1742683).

40081157 is a wasteful number, since it uses less digits than its factorization.

40081157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742682.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 40081157 is about 6330.9680934277. The cubic root of 40081157 is about 342.2263272817.

The spelling of 40081157 in words is "forty million, eighty-one thousand, one hundred fifty-seven".