190398820 has 12 divisors (see below), whose sum is σ = 399837564. Its totient is φ = 76159520.

The previous prime is 190398799. The next prime is 190398821. The reversal of 190398820 is 28893091.

It can be written as a sum of positive squares in 2 ways, for example, as 95570176 + 94828644 = 9776^2 + 9738^2 .

It is not an unprimeable number, because it can be changed into a prime (190398821) 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, 4759951 + ... + 4759990.

It is an arithmetic number, because the mean of its divisors is an integer number (33319797).

Almost surely, 2^190398820 is an apocalyptic number.

190398820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

190398820 is an abundant number, since it is smaller than the sum of its proper divisors (209438744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

190398820 is a wasteful number, since it uses less digits than its factorization.

190398820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9519950 (or 9519948 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 190398820 is about 13798.5078903481. The cubic root of 190398820 is about 575.2916680318.

The spelling of 190398820 in words is "one hundred ninety million, three hundred ninety-eight thousand, eight hundred twenty".