31403898 has 48 divisors (see below), whose sum is σ = 71118216. Its totient is φ = 10005120.

The previous prime is 31403893. The next prime is 31403921. The reversal of 31403898 is 89830413.

It can be written as a sum of positive squares in 4 ways, for example, as 17363889 + 14040009 = 4167^2 + 3747^2 .

It is not an unprimeable number, because it can be changed into a prime (31403893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40240 + ... + 41012.

Almost surely, 2^31403898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31403898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35559108).

31403898 is an abundant number, since it is smaller than the sum of its proper divisors (39714318).

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

31403898 is a wasteful number, since it uses less digits than its factorization.

31403898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879 (or 876 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 31403898 is about 5603.9180936199. The cubic root of 31403898 is about 315.4964808650.

The spelling of 31403898 in words is "thirty-one million, four hundred three thousand, eight hundred ninety-eight".