190739640 has 128 divisors (see below), whose sum is σ = 704309760. Its totient is φ = 40241664.

The previous prime is 190739639. The next prime is 190739671. The reversal of 190739640 is 46937091.

190739640 = 407² + 408² + ... + 861².

It is a super-2 number, since 2×190739640² = 72763220534659200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 2187 + ... + 19653.

It is an arithmetic number, because the mean of its divisors is an integer number (5502420).

Almost surely, 2^190739640 is an apocalyptic number.

190739640 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 190739640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352154880).

190739640 is an abundant number, since it is smaller than the sum of its proper divisors (513570120).

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

190739640 is a wasteful number, since it uses less digits than its factorization.

190739640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17501 (or 17497 counting only the distinct ones).

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

The square root of 190739640 is about 13810.8522546583. The cubic root of 190739640 is about 575.6347269356.

The spelling of 190739640 in words is "one hundred ninety million, seven hundred thirty-nine thousand, six hundred forty".