397720190 has 16 divisors (see below), whose sum is σ = 818167392. Its totient is φ = 136361184.

The previous prime is 397720171. The next prime is 397720223. The reversal of 397720190 is 91027793.

It is a super-2 number, since 2×397720190² = 316362699067272200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2840789 + ... + 2840928.

It is an arithmetic number, because the mean of its divisors is an integer number (51135462).

Almost surely, 2^397720190 is an apocalyptic number.

397720190 is an abundant number, since it is smaller than the sum of its proper divisors (420447202).

397720190 is a wasteful number, since it uses less digits than its factorization.

397720190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5681731.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 397720190 is about 19942.9233062758. The cubic root of 397720190 is about 735.4038165392.

The spelling of 397720190 in words is "three hundred ninety-seven million, seven hundred twenty thousand, one hundred ninety".