40639995 has 32 divisors (see below), whose sum is σ = 78819840. Its totient is φ = 19703520.

The previous prime is 40639987. The next prime is 40640009. The reversal of 40639995 is 59993604.

It is a happy number.

40639995 is a `hidden beast` number, since 4 + 0 + 639 + 9 + 9 + 5 = 666.

It is not a de Polignac number, because 40639995 - 2³ = 40639987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 40639995.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12199 + ... + 15168.

It is an arithmetic number, because the mean of its divisors is an integer number (2463120).

Almost surely, 2^40639995 is an apocalyptic number.

40639995 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

40639995 is a deficient number, since it is larger than the sum of its proper divisors (38179845).

40639995 is a wasteful number, since it uses less digits than its factorization.

40639995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27392 (or 27386 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 40639995 is about 6374.9505880438. The cubic root of 40639995 is about 343.8095072737.

It can be divided in two parts, 406 and 39995, that added together give a square (40401 = 201²).

The spelling of 40639995 in words is "forty million, six hundred thirty-nine thousand, nine hundred ninety-five".