400391497390 has 16 divisors (see below), whose sum is σ = 720754345008. Its totient is φ = 160145565696.

The previous prime is 400391497381. The next prime is 400391497393. The reversal of 400391497390 is 93794193004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400391497393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1225932 + ... + 1517791.

It is an arithmetic number, because the mean of its divisors is an integer number (45047146563).

Almost surely, 2^400391497390 is an apocalyptic number.

400391497390 is a deficient number, since it is larger than the sum of its proper divisors (320362847618).

400391497390 is a wasteful number, since it uses less digits than its factorization.

400391497390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758323.

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 400391497390 in words is "four hundred billion, three hundred ninety-one million, four hundred ninety-seven thousand, three hundred ninety".