31389963 has 16 divisors (see below), whose sum is σ = 47644416. Its totient is φ = 18196640.

The previous prime is 31389961. The next prime is 31389983. The reversal of 31389963 is 36998313.

It is not a de Polignac number, because 31389963 - 2¹ = 31389961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31389961) 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, 19920 + ... + 21437.

It is an arithmetic number, because the mean of its divisors is an integer number (2977776).

Almost surely, 2^31389963 is an apocalyptic number.

31389963 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31389963 is a deficient number, since it is larger than the sum of its proper divisors (16254453).

31389963 is a wasteful number, since it uses less digits than its factorization.

31389963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41394.

The product of its digits is 104976, while the sum is 42.

The square root of 31389963 is about 5602.6746291392. The cubic root of 31389963 is about 315.4498083797.

The spelling of 31389963 in words is "thirty-one million, three hundred eighty-nine thousand, nine hundred sixty-three".