31983945 has 16 divisors (see below), whose sum is σ = 58485120. Its totient is φ = 14621184.

The previous prime is 31983937. The next prime is 31983949. The reversal of 31983945 is 54938913.

It is not a de Polignac number, because 31983945 - 2³ = 31983937 is a prime.

It is a super-3 number, since 3×31983945³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31983897 and 31983906.

It is not an unprimeable number, because it can be changed into a prime (31983949) 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, 152200 + ... + 152409.

It is an arithmetic number, because the mean of its divisors is an integer number (3655320).

Almost surely, 2^31983945 is an apocalyptic number.

31983945 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31983945 is a deficient number, since it is larger than the sum of its proper divisors (26501175).

31983945 is a wasteful number, since it uses less digits than its factorization.

31983945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304624.

The product of its digits is 116640, while the sum is 42.

The square root of 31983945 is about 5655.4349965321. The cubic root of 31983945 is about 317.4271062534.

The spelling of 31983945 in words is "thirty-one million, nine hundred eighty-three thousand, nine hundred forty-five".