31401408 has 56 divisors (see below), whose sum is σ = 85130640. Its totient is φ = 10209280.

The previous prime is 31401407. The next prime is 31401439. The reversal of 31401408 is 80410413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31401401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5878 + ... + 9866.

It is an arithmetic number, because the mean of its divisors is an integer number (1520190).

Almost surely, 2^31401408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31401408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42565320).

31401408 is an abundant number, since it is smaller than the sum of its proper divisors (53729232).

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

31401408 is a wasteful number, since it uses less digits than its factorization.

31401408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045 (or 4035 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31401408 is about 5603.6959232278. The cubic root of 31401408 is about 315.4881421231.

The spelling of 31401408 in words is "thirty-one million, four hundred one thousand, four hundred eight".