399426017536 has 288 divisors, whose sum is σ = 1007736477440. Its totient is φ = 153782157312.

The previous prime is 399426017489. The next prime is 399426017567. The reversal of 399426017536 is 635710624993.

It is a super-2 number, since 2×399426017536² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 373644010 + ... + 373645078.

Almost surely, 2^399426017536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399426017536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503868238720).

399426017536 is an abundant number, since it is smaller than the sum of its proper divisors (608310459904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399426017536 is a wasteful number, since it uses less digits than its factorization.

399426017536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 55.

The spelling of 399426017536 in words is "three hundred ninety-nine billion, four hundred twenty-six million, seventeen thousand, five hundred thirty-six".