31400889 has 16 divisors (see below), whose sum is σ = 45532032. Its totient is φ = 19133568.

The previous prime is 31400869. The next prime is 31400893. The reversal of 31400889 is 98800413.

It is not a de Polignac number, because 31400889 - 2¹² = 31396793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31400839) 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, 109 + ... + 7925.

It is an arithmetic number, because the mean of its divisors is an integer number (2845752).

Almost surely, 2^31400889 is an apocalyptic number.

31400889 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

31400889 is a deficient number, since it is larger than the sum of its proper divisors (14131143).

31400889 is a wasteful number, since it uses less digits than its factorization.

31400889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7936.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 31400889 is about 5603.6496143139. The cubic root of 31400889 is about 315.4864039925.

The spelling of 31400889 in words is "thirty-one million, four hundred thousand, eight hundred eighty-nine".