31200426 has 48 divisors (see below), whose sum is σ = 70394688. Its totient is φ = 9979200.

The previous prime is 31200409. The next prime is 31200431. The reversal of 31200426 is 62400213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31200399 and 31200408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49131 + ... + 49761.

It is an arithmetic number, because the mean of its divisors is an integer number (1466556).

Almost surely, 2^31200426 is an apocalyptic number.

31200426 is an abundant number, since it is smaller than the sum of its proper divisors (39194262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31200426 is a wasteful number, since it uses less digits than its factorization.

31200426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31200426 is about 5585.7341504945. The cubic root of 31200426 is about 314.8136161188.

Adding to 31200426 its reverse (62400213), we get a palindrome (93600639).

It can be divided in two parts, 31200 and 426, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 31200426 in words is "thirty-one million, two hundred thousand, four hundred twenty-six".