18401429 has 8 divisors (see below), whose sum is σ = 19628568. Its totient is φ = 17190400.

The previous prime is 18401423. The next prime is 18401431. The reversal of 18401429 is 92410481.

It can be written as a sum of positive squares in 4 ways, for example, as 7279204 + 11122225 = 2698^2 + 3335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18401429 - 2⁴ = 18401413 is a prime.

It is a super-2 number, since 2×18401429² = 677225178484082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18401423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1622 + ... + 6279.

It is an arithmetic number, because the mean of its divisors is an integer number (2453571).

Almost surely, 2^18401429 is an apocalyptic number.

It is an amenable number.

18401429 is a deficient number, since it is larger than the sum of its proper divisors (1227139).

18401429 is a wasteful number, since it uses less digits than its factorization.

18401429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8055.

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

The square root of 18401429 is about 4289.6886833429. The cubic root of 18401429 is about 264.0080585618.

The spelling of 18401429 in words is "eighteen million, four hundred one thousand, four hundred twenty-nine".