399126746 has 4 divisors (see below), whose sum is σ = 598690122. Its totient is φ = 199563372.

The previous prime is 399126727. The next prime is 399126769. The reversal of 399126746 is 647621993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 647621993 = 7529 ⋅86017.

It can be written as a sum of positive squares in only one way, i.e., 331640521 + 67486225 = 18211^2 + 8215^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 399126746.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99781685 + ... + 99781688.

Almost surely, 2^399126746 is an apocalyptic number.

399126746 is a deficient number, since it is larger than the sum of its proper divisors (199563376).

399126746 is a wasteful number, since it uses less digits than its factorization.

399126746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199563375.

The product of its digits is 489888, while the sum is 47.

The square root of 399126746 is about 19978.1567217799. The cubic root of 399126746 is about 736.2697265275.

The spelling of 399126746 in words is "three hundred ninety-nine million, one hundred twenty-six thousand, seven hundred forty-six".