190397640 has 32 divisors (see below), whose sum is σ = 571193280. Its totient is φ = 50772672.

The previous prime is 190397633. The next prime is 190397681. The reversal of 190397640 is 46793091.

190397640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×190397640² = 72502522635139200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 793204 + ... + 793443.

It is an arithmetic number, because the mean of its divisors is an integer number (17849790).

Almost surely, 2^190397640 is an apocalyptic number.

190397640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

190397640 is an abundant number, since it is smaller than the sum of its proper divisors (380795640).

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

190397640 is a wasteful number, since it uses less digits than its factorization.

190397640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586661 (or 1586657 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 190397640 is about 13798.4651320355. The cubic root of 190397640 is about 575.2904795693.

The spelling of 190397640 in words is "one hundred ninety million, three hundred ninety-seven thousand, six hundred forty".