31481898 has 32 divisors (see below), whose sum is σ = 75747840. Its totient is φ = 8521200.

The previous prime is 31481887. The next prime is 31481899. The reversal of 31481898 is 89818413.

It is a super-2 number, since 2×31481898² = 1982219803364808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (31481899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18928 + ... + 20523.

It is an arithmetic number, because the mean of its divisors is an integer number (2367120).

Almost surely, 2^31481898 is an apocalyptic number.

31481898 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

31481898 is an abundant number, since it is smaller than the sum of its proper divisors (44265942).

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

31481898 is a wasteful number, since it uses less digits than its factorization.

31481898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39482.

The product of its digits is 55296, while the sum is 42.

The square root of 31481898 is about 5610.8731940759. The cubic root of 31481898 is about 315.7574716021.

The spelling of 31481898 in words is "thirty-one million, four hundred eighty-one thousand, eight hundred ninety-eight".