31402445 has 4 divisors (see below), whose sum is σ = 37682940. Its totient is φ = 25121952.

The previous prime is 31402409. The next prime is 31402471. The reversal of 31402445 is 54420413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11812969 + 19589476 = 3437^2 + 4426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31402445 is a prime.

It is a super-2 number, since 2×31402445² = 1972227103956050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31402445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3140240 + ... + 3140249.

It is an arithmetic number, because the mean of its divisors is an integer number (9420735).

Almost surely, 2^31402445 is an apocalyptic number.

It is an amenable number.

31402445 is a deficient number, since it is larger than the sum of its proper divisors (6280495).

31402445 is an equidigital number, since it uses as much as digits as its factorization.

31402445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6280494.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 31402445 is about 5603.7884506823. The cubic root of 31402445 is about 315.4916149780.

Adding to 31402445 its reverse (54420413), we get a palindrome (85822858).

The spelling of 31402445 in words is "thirty-one million, four hundred two thousand, four hundred forty-five".