40372639 has 4 divisors (see below), whose sum is σ = 40391080. Its totient is φ = 40354200.

The previous prime is 40372627. The next prime is 40372679. The reversal of 40372639 is 93627304.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40372639 - 2¹¹ = 40370591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40372679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5412 + ... + 10489.

It is an arithmetic number, because the mean of its divisors is an integer number (10097770).

Almost surely, 2^40372639 is an apocalyptic number.

40372639 is a deficient number, since it is larger than the sum of its proper divisors (18441).

40372639 is a wasteful number, since it uses less digits than its factorization.

40372639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18440.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 40372639 is about 6353.9467262482. The cubic root of 40372639 is about 343.0539146352.

The spelling of 40372639 in words is "forty million, three hundred seventy-two thousand, six hundred thirty-nine".