190390640 has 160 divisors (see below), whose sum is σ = 519609600. Its totient is φ = 64143360.

The previous prime is 190390609. The next prime is 190390657. The reversal of 190390640 is 46093091.

It is a junction number, because it is equal to n+sod(n) for n = 190390597 and 190390606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 986384 + ... + 986576.

It is an arithmetic number, because the mean of its divisors is an integer number (3247560).

Almost surely, 2^190390640 is an apocalyptic number.

190390640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 190390640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259804800).

190390640 is an abundant number, since it is smaller than the sum of its proper divisors (329218960).

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

190390640 is a wasteful number, since it uses less digits than its factorization.

190390640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 190390640 is about 13798.2114783040. The cubic root of 190390640 is about 575.2834292671.

The spelling of 190390640 in words is "one hundred ninety million, three hundred ninety thousand, six hundred forty".