398926690 has 8 divisors (see below), whose sum is σ = 718068060. Its totient is φ = 159570672.

The previous prime is 398926687. The next prime is 398926699. The reversal of 398926690 is 96629893.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 398840841 + 85849 = 19971^2 + 293^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×398926690² = 318285007988712200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (398926699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19946325 + ... + 19946344.

Almost surely, 2^398926690 is an apocalyptic number.

398926690 is a deficient number, since it is larger than the sum of its proper divisors (319141370).

398926690 is a wasteful number, since it uses less digits than its factorization.

398926690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39892676.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 398926690 is about 19973.1492258983. The cubic root of 398926690 is about 736.1466914310.

The spelling of 398926690 in words is "three hundred ninety-eight million, nine hundred twenty-six thousand, six hundred ninety".