31390426 has 8 divisors (see below), whose sum is σ = 47402100. Its totient is φ = 15589728.

The previous prime is 31390409. The next prime is 31390427. The reversal of 31390426 is 62409313.

It can be written as a sum of positive squares in 2 ways, for example, as 30969225 + 421201 = 5565^2 + 649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×31390426² = 1970717688922952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31390394 and 31390403.

It is not an unprimeable number, because it can be changed into a prime (31390427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52371 + ... + 52966.

Almost surely, 2^31390426 is an apocalyptic number.

31390426 is a deficient number, since it is larger than the sum of its proper divisors (16011674).

31390426 is a wasteful number, since it uses less digits than its factorization.

31390426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105488.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 31390426 is about 5602.7159485378. The cubic root of 31390426 is about 315.4513593271.

Adding to 31390426 its reverse (62409313), we get a palindrome (93799739).

The spelling of 31390426 in words is "thirty-one million, three hundred ninety thousand, four hundred twenty-six".