399601620 has 96 divisors (see below), whose sum is σ = 1356243840. Its totient is φ = 96871680.

The previous prime is 399601619. The next prime is 399601637. The reversal of 399601620 is 26106993.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 27697 + ... + 39576.

It is an arithmetic number, because the mean of its divisors is an integer number (14127540).

Almost surely, 2^399601620 is an apocalyptic number.

399601620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399601620 is an abundant number, since it is smaller than the sum of its proper divisors (956642220).

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

399601620 is a wasteful number, since it uses less digits than its factorization.

399601620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67302 (or 67294 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 399601620 is about 19990.0380189734. The cubic root of 399601620 is about 736.5616110661.

The spelling of 399601620 in words is "three hundred ninety-nine million, six hundred one thousand, six hundred twenty".