391280044 has 6 divisors (see below), whose sum is σ = 684740084. Its totient is φ = 195640020.

The previous prime is 391280039. The next prime is 391280051. The reversal of 391280044 is 440082193.

It is a junction number, because it is equal to n+sod(n) for n = 391279988 and 391280015.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48910002 + ... + 48910009.

Almost surely, 2^391280044 is an apocalyptic number.

It is an amenable number.

391280044 is a deficient number, since it is larger than the sum of its proper divisors (293460040).

391280044 is a wasteful number, since it uses less digits than its factorization.

391280044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97820015 (or 97820013 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 391280044 is about 19780.7998827146. The cubic root of 391280044 is about 731.4128165566.

The spelling of 391280044 in words is "three hundred ninety-one million, two hundred eighty thousand, forty-four".