31420218 has 16 divisors (see below), whose sum is σ = 62987616. Its totient is φ = 10448880.

The previous prime is 31420217. The next prime is 31420223. The reversal of 31420218 is 81202413.

It is a junction number, because it is equal to n+sod(n) for n = 31420194 and 31420203.

It is not an unprimeable number, because it can be changed into a prime (31420217) 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, 3253 + ... + 8568.

It is an arithmetic number, because the mean of its divisors is an integer number (3936726).

Almost surely, 2^31420218 is an apocalyptic number.

31420218 is an abundant number, since it is smaller than the sum of its proper divisors (31567398).

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

31420218 is a wasteful number, since it uses less digits than its factorization.

31420218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12269.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31420218 is about 5605.3740285551. The cubic root of 31420218 is about 315.5511238789.

The spelling of 31420218 in words is "thirty-one million, four hundred twenty thousand, two hundred eighteen".