40157489 has 4 divisors (see below), whose sum is σ = 41542260. Its totient is φ = 38772720.

The previous prime is 40157479. The next prime is 40157501. The reversal of 40157489 is 98475104.

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 10291264 + 29866225 = 3208^2 + 5465^2 .

It is a cyclic number.

It is not a de Polignac number, because 40157489 - 2⁸ = 40157233 is a prime.

It is a super-2 number, since 2×40157489² = 3225247845570242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40157419) 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, 692342 + ... + 692399.

It is an arithmetic number, because the mean of its divisors is an integer number (10385565).

Almost surely, 2^40157489 is an apocalyptic number.

It is an amenable number.

40157489 is a deficient number, since it is larger than the sum of its proper divisors (1384771).

40157489 is a wasteful number, since it uses less digits than its factorization.

40157489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384770.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 40157489 is about 6336.9936878618. The cubic root of 40157489 is about 342.4434388990.

The spelling of 40157489 in words is "forty million, one hundred fifty-seven thousand, four hundred eighty-nine".