398170090 has 32 divisors (see below), whose sum is σ = 768035520. Its totient is φ = 148088064.

The previous prime is 398170051. The next prime is 398170109. The reversal of 398170090 is 90071893.

398170090 is a nontrivial binomial coefficient, being equal to C(28220, 2).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1 + ... + 28219.

It is an arithmetic number, because the mean of its divisors is an integer number (24001110).

Almost surely, 2^398170090 is an apocalyptic number.

398170090 is the 28219-th triangular number and also the 14110-th hexagonal number.

398170090 is the 9407-th centered nonagonal number.

398170090 is a deficient number, since it is larger than the sum of its proper divisors (369865430).

398170090 is a wasteful number, since it uses less digits than its factorization.

398170090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28326.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 398170090 is about 19954.1998085616. The cubic root of 398170090 is about 735.6810076469.

The spelling of 398170090 in words is "three hundred ninety-eight million, one hundred seventy thousand, ninety".