31040138 has 8 divisors (see below), whose sum is σ = 46651140. Its totient is φ = 15489760.

The previous prime is 31040137. The next prime is 31040153. The reversal of 31040138 is 83104013.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26142769 + 4897369 = 5113^2 + 2213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31040137) 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, 13853 + ... + 15936.

Almost surely, 2^31040138 is an apocalyptic number.

31040138 is a deficient number, since it is larger than the sum of its proper divisors (15611002).

31040138 is a wasteful number, since it uses less digits than its factorization.

31040138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30312.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 31040138 is about 5571.3676956381. The cubic root of 31040138 is about 314.2735860530.

The spelling of 31040138 in words is "thirty-one million, forty thousand, one hundred thirty-eight".