391777045 has 16 divisors (see below), whose sum is σ = 513293760. Its totient is φ = 284694400.

The previous prime is 391777027. The next prime is 391777049. The reversal of 391777045 is 540777193.

It is not a de Polignac number, because 391777045 - 2⁵ = 391777013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391776992 and 391777010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391777049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92586 + ... + 96724.

It is an arithmetic number, because the mean of its divisors is an integer number (32080860).

Almost surely, 2^391777045 is an apocalyptic number.

It is an amenable number.

391777045 is a deficient number, since it is larger than the sum of its proper divisors (121516715).

391777045 is a wasteful number, since it uses less digits than its factorization.

391777045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5876.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 391777045 is about 19793.3586083818. The cubic root of 391777045 is about 731.7223639042.

The spelling of 391777045 in words is "three hundred ninety-one million, seven hundred seventy-seven thousand, forty-five".