31420018 has 8 divisors (see below), whose sum is σ = 53862912. Its totient is φ = 13465716.

The previous prime is 31420009. The next prime is 31420027. The reversal of 31420018 is 81002413.

It is an interprime number because it is at equal distance from previous prime (31420009) and next prime (31420027).

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

It is a super-2 number, since 2×31420018² = 1974435062240648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31419977 and 31420004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122130 + ... + 1122157.

It is an arithmetic number, because the mean of its divisors is an integer number (6732864).

Almost surely, 2^31420018 is an apocalyptic number.

31420018 is a deficient number, since it is larger than the sum of its proper divisors (22442894).

31420018 is a wasteful number, since it uses less digits than its factorization.

31420018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244296.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 31420018 is about 5605.3561885040. The cubic root of 31420018 is about 315.5504543486.

The spelling of 31420018 in words is "thirty-one million, four hundred twenty thousand, eighteen".