399418204690 has 16 divisors (see below), whose sum is σ = 726071114520. Its totient is φ = 158185427200.

The previous prime is 399418204667. The next prime is 399418204693. The reversal of 399418204690 is 96402814993.

It can be written as a sum of positive squares in 4 ways, for example, as 398081497969 + 1336706721 = 630937^2 + 36561^2 .

It is a super-2 number, since 2×399418204690² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399418204693) 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, 197730775 + ... + 197732794.

Almost surely, 2^399418204690 is an apocalyptic number.

399418204690 is a deficient number, since it is larger than the sum of its proper divisors (326652909830).

399418204690 is a wasteful number, since it uses less digits than its factorization.

399418204690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395463677.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 399418204690 in words is "three hundred ninety-nine billion, four hundred eighteen million, two hundred four thousand, six hundred ninety".