40157897 has 4 divisors (see below), whose sum is σ = 43246980. Its totient is φ = 37068816.

The previous prime is 40157891. The next prime is 40157899. The reversal of 40157897 is 79875104.

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 24245776 + 15912121 = 4924^2 + 3989^2 .

It is a cyclic number.

It is not a de Polignac number, because 40157897 - 2¹⁴ = 40141513 is a prime.

It is a super-2 number, since 2×40157897² = 3225313382925218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40157891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544522 + ... + 1544547.

It is an arithmetic number, because the mean of its divisors is an integer number (10811745).

Almost surely, 2^40157897 is an apocalyptic number.

It is an amenable number.

40157897 is a deficient number, since it is larger than the sum of its proper divisors (3089083).

40157897 is a wasteful number, since it uses less digits than its factorization.

40157897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3089082.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 40157897 is about 6337.0258797010. The cubic root of 40157897 is about 342.4445986366. Note that the first 3 decimals are identical.

The spelling of 40157897 in words is "forty million, one hundred fifty-seven thousand, eight hundred ninety-seven".