189397903 has 4 divisors (see below), whose sum is σ = 189453168. Its totient is φ = 189342640.

The previous prime is 189397891. The next prime is 189397913. The reversal of 189397903 is 309793981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189397903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189397913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22126 + ... + 29467.

It is an arithmetic number, because the mean of its divisors is an integer number (47363292).

Almost surely, 2^189397903 is an apocalyptic number.

189397903 is a deficient number, since it is larger than the sum of its proper divisors (55265).

189397903 is an equidigital number, since it uses as much as digits as its factorization.

189397903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55264.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 189397903 is about 13762.1910682856. The cubic root of 189397903 is about 574.2818032556.

The spelling of 189397903 in words is "one hundred eighty-nine million, three hundred ninety-seven thousand, nine hundred three".