161654388 has 24 divisors (see below), whose sum is σ = 431078592. Its totient is φ = 46186944.

The previous prime is 161654371. The next prime is 161654407. The reversal of 161654388 is 883456161.

It is a super-2 number, since 2×161654388² = 52264282319309088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 962145 + ... + 962312.

It is an arithmetic number, because the mean of its divisors is an integer number (17961608).

Almost surely, 2^161654388 is an apocalyptic number.

It is an amenable number.

161654388 is an abundant number, since it is smaller than the sum of its proper divisors (269424204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161654388 is a wasteful number, since it uses less digits than its factorization.

161654388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924471 (or 1924469 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 161654388 is about 12714.3378907437. The cubic root of 161654388 is about 544.7482359861.

The spelling of 161654388 in words is "one hundred sixty-one million, six hundred fifty-four thousand, three hundred eighty-eight".