31400000 has 84 divisors (see below), whose sum is σ = 78377796. Its totient is φ = 12480000.

The previous prime is 31399999. The next prime is 31400021. The reversal of 31400000 is 413.

It can be written as a sum of positive squares in 6 ways, for example, as 28217344 + 3182656 = 5312^2 + 1784^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199922 + ... + 200078.

It is an arithmetic number, because the mean of its divisors is an integer number (933069).

Almost surely, 2^31400000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39188898).

31400000 is an abundant number, since it is smaller than the sum of its proper divisors (46977796).

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

31400000 is an frugal number, since it uses more digits than its factorization.

31400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 31400000 is about 5603.5702904488. The cubic root of 31400000 is about 315.4834266876.

Adding to 31400000 its reverse (413), we get a palindrome (31400413).

The spelling of 31400000 in words is "thirty-one million, four hundred thousand".