1239994426 has 16 divisors (see below), whose sum is σ = 2047042368. Its totient is φ = 558644800.

The previous prime is 1239994411. The next prime is 1239994439. The reversal of 1239994426 is 6244999321.

It is a happy number.

It is a super-2 number, since 2×1239994426² = 3075172353022138952, 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 1239994426.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246910 + ... + 251881.

It is an arithmetic number, because the mean of its divisors is an integer number (127940148).

Almost surely, 2^1239994426 is an apocalyptic number.

1239994426 is a deficient number, since it is larger than the sum of its proper divisors (807047942).

1239994426 is a wasteful number, since it uses less digits than its factorization.

1239994426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498917.

The product of its digits is 839808, while the sum is 49.

The square root of 1239994426 is about 35213.5545777475. The cubic root of 1239994426 is about 1074.3354612137.

The spelling of 1239994426 in words is "one billion, two hundred thirty-nine million, nine hundred ninety-four thousand, four hundred twenty-six".