399662841840 has 160 divisors (see below), whose sum is σ = 1277847069696. Its totient is φ = 103276108800.

The previous prime is 399662841833. The next prime is 399662841889. The reversal of 399662841840 is 48148266993.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 963879 + ... + 1314681.

Almost surely, 2^399662841840 is an apocalyptic number.

399662841840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399662841840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638923534848).

399662841840 is an abundant number, since it is smaller than the sum of its proper divisors (878184227856).

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

399662841840 is a wasteful number, since it uses less digits than its factorization.

399662841840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350967 (or 350961 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 60.

The spelling of 399662841840 in words is "three hundred ninety-nine billion, six hundred sixty-two million, eight hundred forty-one thousand, eight hundred forty".