31420436 has 6 divisors (see below), whose sum is σ = 54985770. Its totient is φ = 15710216.

The previous prime is 31420409. The next prime is 31420447. The reversal of 31420436 is 63402413.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25200400 + 6220036 = 5020^2 + 2494^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3927551 + ... + 3927558.

It is an arithmetic number, because the mean of its divisors is an integer number (9164295).

Almost surely, 2^31420436 is an apocalyptic number.

It is an amenable number.

31420436 is a deficient number, since it is larger than the sum of its proper divisors (23565334).

31420436 is a wasteful number, since it uses less digits than its factorization.

31420436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7855113 (or 7855111 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 31420436 is about 5605.3934741461. The cubic root of 31420436 is about 315.5518536636.

Adding to 31420436 its reverse (63402413), we get a palindrome (94822849).

The spelling of 31420436 in words is "thirty-one million, four hundred twenty thousand, four hundred thirty-six".