31389955 has 8 divisors (see below), whose sum is σ = 37965312. Its totient is φ = 24913728.

The previous prime is 31389923. The next prime is 31389961. The reversal of 31389955 is 55998313.

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

It is a cyclic number.

It is not a de Polignac number, because 31389955 - 2⁵ = 31389923 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24082 + ... + 25351.

It is an arithmetic number, because the mean of its divisors is an integer number (4745664).

Almost surely, 2^31389955 is an apocalyptic number.

31389955 is a deficient number, since it is larger than the sum of its proper divisors (6575357).

31389955 is a wasteful number, since it uses less digits than its factorization.

31389955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49565.

The product of its digits is 145800, while the sum is 43.

The square root of 31389955 is about 5602.6739151944. The cubic root of 31389955 is about 315.4497815813.

The spelling of 31389955 in words is "thirty-one million, three hundred eighty-nine thousand, nine hundred fifty-five".