31420402 has 16 divisors (see below), whose sum is σ = 51132312. Its totient is φ = 14394240.

The previous prime is 31420381. The next prime is 31420409. The reversal of 31420402 is 20402413.

It can be written as a sum of positive squares in 4 ways, for example, as 24810361 + 6610041 = 4981^2 + 2571^2 .

It is not an unprimeable number, because it can be changed into a prime (31420409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849 + ... + 7972.

Almost surely, 2^31420402 is an apocalyptic number.

31420402 is a deficient number, since it is larger than the sum of its proper divisors (19711910).

31420402 is a wasteful number, since it uses less digits than its factorization.

31420402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8973.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 31420402 is about 5605.3904413520. The cubic root of 31420402 is about 315.5517398442.

Adding to 31420402 its reverse (20402413), we get a palindrome (51822815).

The spelling of 31420402 in words is "thirty-one million, four hundred twenty thousand, four hundred two".