399979140407 has 16 divisors (see below), whose sum is σ = 520356828672. Its totient is φ = 298121097120.

The previous prime is 399979140397. The next prime is 399979140413. The reversal of 399979140407 is 704041979993.

It is a happy number.

It is not a de Polignac number, because 399979140407 - 2¹⁰ = 399979139383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399979140407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399979140467) 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, 112922888 + ... + 112926429.

It is an arithmetic number, because the mean of its divisors is an integer number (32522301792).

Almost surely, 2^399979140407 is an apocalyptic number.

399979140407 is a deficient number, since it is larger than the sum of its proper divisors (120377688265).

399979140407 is a wasteful number, since it uses less digits than its factorization.

399979140407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225849358.

The product of its (nonzero) digits is 15431472, while the sum is 62.

The spelling of 399979140407 in words is "three hundred ninety-nine billion, nine hundred seventy-nine million, one hundred forty thousand, four hundred seven".