31401138 has 8 divisors (see below), whose sum is σ = 62802288. Its totient is φ = 10467044.

The previous prime is 31401133. The next prime is 31401151. The reversal of 31401138 is 83110413.

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

31401138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (31401133) 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, 2616756 + ... + 2616767.

It is an arithmetic number, because the mean of its divisors is an integer number (7850286).

Almost surely, 2^31401138 is an apocalyptic number.

31401138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31401138 is a wasteful number, since it uses less digits than its factorization.

31401138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5233528.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 31401138 is about 5603.6718319331. The cubic root of 31401138 is about 315.4872378957.

It can be divided in two parts, 3140 and 1138, that added together give a triangular number (4278 = T₉₂).

The spelling of 31401138 in words is "thirty-one million, four hundred one thousand, one hundred thirty-eight".