40128507 has 8 divisors (see below), whose sum is σ = 59449680. Its totient is φ = 26752320.

The previous prime is 40128499. The next prime is 40128509. The reversal of 40128507 is 70582104.

It is not a de Polignac number, because 40128507 - 2³ = 40128499 is a prime.

It is a super-2 number, since 2×40128507² = 3220594148098098, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1486241 = 40128507 / (4 + 0 + 1 + 2 + 8 + 5 + 0 + 7).

It is not an unprimeable number, because it can be changed into a prime (40128509) 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, 743094 + ... + 743147.

It is an arithmetic number, because the mean of its divisors is an integer number (7431210).

Almost surely, 2^40128507 is an apocalyptic number.

40128507 is a deficient number, since it is larger than the sum of its proper divisors (19321173).

40128507 is a wasteful number, since it uses less digits than its factorization.

40128507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486250 (or 1486244 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 40128507 is about 6334.7065441108. The cubic root of 40128507 is about 342.3610376290.

The spelling of 40128507 in words is "forty million, one hundred twenty-eight thousand, five hundred seven".