40390624 has 12 divisors (see below), whose sum is σ = 79519104. Its totient is φ = 20195296.

The previous prime is 40390621. The next prime is 40390627. The reversal of 40390624 is 42609304.

It is an interprime number because it is at equal distance from previous prime (40390621) and next prime (40390627).

It is a junction number, because it is equal to n+sod(n) for n = 40390592 and 40390601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40390621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631072 + ... + 631135.

It is an arithmetic number, because the mean of its divisors is an integer number (6626592).

Almost surely, 2^40390624 is an apocalyptic number.

It is an amenable number.

40390624 is a deficient number, since it is larger than the sum of its proper divisors (39128480).

40390624 is a wasteful number, since it uses less digits than its factorization.

40390624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262217 (or 1262209 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 40390624 is about 6355.3618307694. The cubic root of 40390624 is about 343.1048477165.

Adding to 40390624 its reverse (42609304), we get a palindrome (82999928).

It can be divided in two parts, 40390 and 624, that added together give a palindrome (41014).

The spelling of 40390624 in words is "forty million, three hundred ninety thousand, six hundred twenty-four".