399012727720 has 64 divisors (see below), whose sum is σ = 948393748800. Its totient is φ = 150666647040.

The previous prime is 399012727697. The next prime is 399012727727. The reversal of 399012727720 is 27727210993.

It is a happy number.

It is a super-2 number, since 2×399012727720² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399012727727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720634 + ... + 1147753.

It is an arithmetic number, because the mean of its divisors is an integer number (14818652325).

Almost surely, 2^399012727720 is an apocalyptic number.

It is an amenable number.

399012727720 is an abundant number, since it is smaller than the sum of its proper divisors (549381021080).

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

399012727720 is a wasteful number, since it uses less digits than its factorization.

399012727720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868698 (or 1868694 counting only the distinct ones).

The product of its (nonzero) digits is 666792, while the sum is 49.

The spelling of 399012727720 in words is "three hundred ninety-nine billion, twelve million, seven hundred twenty-seven thousand, seven hundred twenty".