156804493 has 4 divisors (see below), whose sum is σ = 158789440. Its totient is φ = 154819548.

The previous prime is 156804491. The next prime is 156804509. The reversal of 156804493 is 394408651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 156804493 - 2¹ = 156804491 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 (156804491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992355 + ... + 992512.

It is an arithmetic number, because the mean of its divisors is an integer number (39697360).

Almost surely, 2^156804493 is an apocalyptic number.

It is an amenable number.

156804493 is a deficient number, since it is larger than the sum of its proper divisors (1984947).

156804493 is an equidigital number, since it uses as much as digits as its factorization.

156804493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984946.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 156804493 is about 12522.1600772391. The cubic root of 156804493 is about 539.2450504265.

The spelling of 156804493 in words is "one hundred fifty-six million, eight hundred four thousand, four hundred ninety-three".