31400990 has 8 divisors (see below), whose sum is σ = 56521800. Its totient is φ = 12560392.

The previous prime is 31400983. The next prime is 31401011. The reversal of 31400990 is 9900413.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1570040 + ... + 1570059.

It is an arithmetic number, because the mean of its divisors is an integer number (7065225).

Almost surely, 2^31400990 is an apocalyptic number.

31400990 is a deficient number, since it is larger than the sum of its proper divisors (25120810).

31400990 is a wasteful number, since it uses less digits than its factorization.

31400990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140106.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 31400990 is about 5603.6586262905. The cubic root of 31400990 is about 315.4867422429.

The spelling of 31400990 in words is "thirty-one million, four hundred thousand, nine hundred ninety".