399949430776 has 64 divisors (see below), whose sum is σ = 868932852480. Its totient is φ = 169039733760.

The previous prime is 399949430761. The next prime is 399949430791. The reversal of 399949430776 is 677034949993.

It is an interprime number because it is at equal distance from previous prime (399949430761) and next prime (399949430791).

It is a super-3 number, since 3×399949430776³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1407171 + ... + 1667341.

It is an arithmetic number, because the mean of its divisors is an integer number (13577075820).

Almost surely, 2^399949430776 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 399949430776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (434466426240).

399949430776 is an abundant number, since it is smaller than the sum of its proper divisors (468983421704).

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

399949430776 is a wasteful number, since it uses less digits than its factorization.

399949430776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260564 (or 260560 counting only the distinct ones).

The product of its (nonzero) digits is 277766496, while the sum is 70.

The spelling of 399949430776 in words is "three hundred ninety-nine billion, nine hundred forty-nine million, four hundred thirty thousand, seven hundred seventy-six".