31390401 has 8 divisors (see below), whose sum is σ = 47833024. Its totient is φ = 17937360.

The previous prime is 31390397. The next prime is 31390409. The reversal of 31390401 is 10409313.

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

It is not a de Polignac number, because 31390401 - 2² = 31390397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1494781 = 31390401 / (3 + 1 + 3 + 9 + 0 + 4 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31390409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 747370 + ... + 747411.

It is an arithmetic number, because the mean of its divisors is an integer number (5979128).

Almost surely, 2^31390401 is an apocalyptic number.

It is an amenable number.

31390401 is a deficient number, since it is larger than the sum of its proper divisors (16442623).

31390401 is a wasteful number, since it uses less digits than its factorization.

31390401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494791.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31390401 is about 5602.7137174766. The cubic root of 31390401 is about 315.4512755830.

Adding to 31390401 its reverse (10409313), we get a palindrome (41799714).

The spelling of 31390401 in words is "thirty-one million, three hundred ninety thousand, four hundred one".