398602090 has 16 divisors (see below), whose sum is σ = 717864840. Its totient is φ = 159356160.

The previous prime is 398602067. The next prime is 398602091. The reversal of 398602090 is 90206893.

It can be written as a sum of positive squares in 4 ways, for example, as 329894569 + 68707521 = 18163^2 + 8289^2 .

It is a super-3 number, since 3×398602090³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (398602091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11350 + ... + 30430.

Almost surely, 2^398602090 is an apocalyptic number.

398602090 is a deficient number, since it is larger than the sum of its proper divisors (319262750).

398602090 is a wasteful number, since it uses less digits than its factorization.

398602090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21177.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 398602090 is about 19965.0216628983. The cubic root of 398602090 is about 735.9469738203.

The spelling of 398602090 in words is "three hundred ninety-eight million, six hundred two thousand, ninety".