31423398 has 16 divisors (see below), whose sum is σ = 64874496. Its totient is φ = 10136520.

The previous prime is 31423391. The next prime is 31423421. The reversal of 31423398 is 89332413.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423391) 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, 84286 + ... + 84657.

It is an arithmetic number, because the mean of its divisors is an integer number (4054656).

Almost surely, 2^31423398 is an apocalyptic number.

31423398 is an abundant number, since it is smaller than the sum of its proper divisors (33451098).

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

31423398 is a wasteful number, since it uses less digits than its factorization.

31423398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168979.

The product of its digits is 15552, while the sum is 33.

The square root of 31423398 is about 5605.6576777395. The cubic root of 31423398 is about 315.5617690280.

The spelling of 31423398 in words is "thirty-one million, four hundred twenty-three thousand, three hundred ninety-eight".