40147257 has 8 divisors (see below), whose sum is σ = 54976576. Its totient is φ = 26041392.

The previous prime is 40147249. The next prime is 40147267. The reversal of 40147257 is 75274104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40147257 - 2³ = 40147249 is a prime.

It is a super-2 number, since 2×40147257² = 3223604489248098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40147267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180733 + ... + 180954.

It is an arithmetic number, because the mean of its divisors is an integer number (6872072).

Almost surely, 2^40147257 is an apocalyptic number.

It is an amenable number.

40147257 is a deficient number, since it is larger than the sum of its proper divisors (14829319).

40147257 is a wasteful number, since it uses less digits than its factorization.

40147257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361727.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 40147257 is about 6336.1863135486. The cubic root of 40147257 is about 342.4143519301.

It can be divided in two parts, 40147 and 257, that added together give a palindrome (40404).

The spelling of 40147257 in words is "forty million, one hundred forty-seven thousand, two hundred fifty-seven".