40172251 has 32 divisors (see below), whose sum is σ = 50803200. Its totient is φ = 31000320.

The previous prime is 40172243. The next prime is 40172267. The reversal of 40172251 is 15227104.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40172251 - 2³ = 40172243 is a prime.

It is a super-2 number, since 2×40172251² = 3227619500814002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40172201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 288940 + ... + 289078.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 2^40172251 is an apocalyptic number.

40172251 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

40172251 is a deficient number, since it is larger than the sum of its proper divisors (10630949).

40172251 is a wasteful number, since it uses less digits than its factorization.

40172251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 40172251 is about 6338.1583287261. The cubic root of 40172251 is about 342.4853947987.

Adding to 40172251 its reverse (15227104), we get a palindrome (55399355).

The spelling of 40172251 in words is "forty million, one hundred seventy-two thousand, two hundred fifty-one".