161904429 has 12 divisors (see below), whose sum is σ = 244030176. Its totient is φ = 103243272.

The previous prime is 161904427. The next prime is 161904451. The reversal of 161904429 is 924409161.

It is a happy number.

It is not a de Polignac number, because 161904429 - 2¹ = 161904427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161904393 and 161904402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161904427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390867 + ... + 391280.

It is an arithmetic number, because the mean of its divisors is an integer number (20335848).

Almost surely, 2^161904429 is an apocalyptic number.

It is an amenable number.

161904429 is a deficient number, since it is larger than the sum of its proper divisors (82125747).

161904429 is a wasteful number, since it uses less digits than its factorization.

161904429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782176 (or 782173 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 161904429 is about 12724.1671240203. The cubic root of 161904429 is about 545.0289567422.

The spelling of 161904429 in words is "one hundred sixty-one million, nine hundred four thousand, four hundred twenty-nine".