31940002 has 4 divisors (see below), whose sum is σ = 47910006. Its totient is φ = 15970000.

The previous prime is 31939993. The next prime is 31940003. The reversal of 31940002 is 20004913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20004913 = 127 ⋅157519.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 6548481 = 5039^2 + 2559^2 .

It is not an unprimeable number, because it can be changed into a prime (31940003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7984999 + ... + 7985002.

Almost surely, 2^31940002 is an apocalyptic number.

31940002 is a deficient number, since it is larger than the sum of its proper divisors (15970004).

31940002 is a wasteful number, since it uses less digits than its factorization.

31940002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15970003.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31940002 is about 5651.5486373206. The cubic root of 31940002 is about 317.2816677395.

Adding to 31940002 its reverse (20004913), we get a palindrome (51944915).

The spelling of 31940002 in words is "thirty-one million, nine hundred forty thousand, two".