155994493 has 4 divisors (see below), whose sum is σ = 156320640. Its totient is φ = 155668348.

The previous prime is 155994473. The next prime is 155994523. The reversal of 155994493 is 394499551.

155994493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 394499551 = 67 ⋅5888053.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155994493 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155994403) 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, 162355 + ... + 163312.

It is an arithmetic number, because the mean of its divisors is an integer number (39080160).

Almost surely, 2^155994493 is an apocalyptic number.

It is an amenable number.

155994493 is a deficient number, since it is larger than the sum of its proper divisors (326147).

155994493 is an equidigital number, since it uses as much as digits as its factorization.

155994493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326146.

The product of its digits is 874800, while the sum is 49.

The square root of 155994493 is about 12489.7755384154. The cubic root of 155994493 is about 538.3149266573.

The spelling of 155994493 in words is "one hundred fifty-five million, nine hundred ninety-four thousand, four hundred ninety-three".