181409402 has 16 divisors (see below), whose sum is σ = 276696000. Its totient is φ = 89184480.

The previous prime is 181409399. The next prime is 181409447. The reversal of 181409402 is 204904181.

It is a super-2 number, since 2×181409402² = 65818742267995208, which contains 22 as substring.

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, 57974 + ... + 61022.

It is an arithmetic number, because the mean of its divisors is an integer number (17293500).

Almost surely, 2^181409402 is an apocalyptic number.

181409402 is a deficient number, since it is larger than the sum of its proper divisors (95286598).

181409402 is a wasteful number, since it uses less digits than its factorization.

181409402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 181409402 is about 13468.8307584586. The cubic root of 181409402 is about 566.0914522157.

The spelling of 181409402 in words is "one hundred eighty-one million, four hundred nine thousand, four hundred two".