189297640390 has 32 divisors (see below), whose sum is σ = 348258631680. Its totient is φ = 74049835104.

The previous prime is 189297640373. The next prime is 189297640409. The reversal of 189297640390 is 93046792981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443679 + ... + 758581.

It is an arithmetic number, because the mean of its divisors is an integer number (10883082240).

Almost surely, 2^189297640390 is an apocalyptic number.

189297640390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189297640390 is a deficient number, since it is larger than the sum of its proper divisors (158960991290).

189297640390 is a wasteful number, since it uses less digits than its factorization.

189297640390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316236.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 189297640390 in words is "one hundred eighty-nine billion, two hundred ninety-seven million, six hundred forty thousand, three hundred ninety".