399900129 has 16 divisors (see below), whose sum is σ = 577697472. Its totient is φ = 245081088.

The previous prime is 399900113. The next prime is 399900131. The reversal of 399900129 is 921009993.

It is a happy number.

It is not a de Polignac number, because 399900129 - 2⁴ = 399900113 is a prime.

It is a super-2 number, since 2×399900129² = 319840226348433282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399900199) 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, 88984 + ... + 93369.

It is an arithmetic number, because the mean of its divisors is an integer number (36106092).

Almost surely, 2^399900129 is an apocalyptic number.

It is an amenable number.

399900129 is a deficient number, since it is larger than the sum of its proper divisors (177797343).

399900129 is a wasteful number, since it uses less digits than its factorization.

399900129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182416.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 399900129 is about 19997.5030691334. The cubic root of 399900129 is about 736.7449733056.

The spelling of 399900129 in words is "three hundred ninety-nine million, nine hundred thousand, one hundred twenty-nine".