390852899 has 16 divisors (see below), whose sum is σ = 423146592. Its totient is φ = 359643648.

The previous prime is 390852887. The next prime is 390852907. The reversal of 390852899 is 998258093.

It is a happy number.

It is a Cunningham number, because it is equal to 19770²-1.

It is a cyclic number.

It is not a de Polignac number, because 390852899 - 2⁴ = 390852883 is a prime.

It is a super-4 number, since 4×390852899⁴ (a number of 35 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 390852899.

It is not an unprimeable number, because it can be changed into a prime (390852809) 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, 335492 + ... + 336654.

It is an arithmetic number, because the mean of its divisors is an integer number (26446662).

Almost surely, 2^390852899 is an apocalyptic number.

390852899 is a deficient number, since it is larger than the sum of its proper divisors (32293693).

390852899 is a wasteful number, since it uses less digits than its factorization.

390852899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The square root of 390852899 is about 19769.9999747092. Note that the first 4 decimals coincide. The cubic root of 390852899 is about 731.1465681355.

The spelling of 390852899 in words is "three hundred ninety million, eight hundred fifty-two thousand, eight hundred ninety-nine".