40639263 has 16 divisors (see below), whose sum is σ = 62021376. Its totient is φ = 23186880.

The previous prime is 40639243. The next prime is 40639273. The reversal of 40639263 is 36293604.

It is not a de Polignac number, because 40639263 - 2⁶ = 40639199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40639223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19395 + ... + 21387.

It is an arithmetic number, because the mean of its divisors is an integer number (3876336).

Almost surely, 2^40639263 is an apocalyptic number.

40639263 is a deficient number, since it is larger than the sum of its proper divisors (21382113).

40639263 is a wasteful number, since it uses less digits than its factorization.

40639263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2974.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 40639263 is about 6374.8931755756. The cubic root of 40639263 is about 343.8074430505.

The spelling of 40639263 in words is "forty million, six hundred thirty-nine thousand, two hundred sixty-three".