40123456 has 14 divisors (see below), whose sum is σ = 79620110. Its totient is φ = 20061696.

The previous prime is 40123453. The next prime is 40123469. The reversal of 40123456 is 65432104.

It can be written as a sum of positive squares in only one way, i.e., 26873856 + 13249600 = 5184^2 + 3640^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40123456.

It is not an unprimeable number, because it can be changed into a prime (40123453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313401 + ... + 313528.

Almost surely, 2^40123456 is an apocalyptic number.

It is an amenable number.

40123456 is a deficient number, since it is larger than the sum of its proper divisors (39496654).

40123456 is an equidigital number, since it uses as much as digits as its factorization.

40123456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626941 (or 626931 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 40123456 is about 6334.3078548489. The cubic root of 40123456 is about 342.3466726277.

The spelling of 40123456 in words is "forty million, one hundred twenty-three thousand, four hundred fifty-six".