16401869 has 4 divisors (see below), whose sum is σ = 17892960. Its totient is φ = 14910780.

The previous prime is 16401839. The next prime is 16401871. The reversal of 16401869 is 96810461.

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.

It is a cyclic number.

It is not a de Polignac number, because 16401869 - 2²⁰ = 15353293 is a prime.

It is a super-2 number, since 2×16401869² = 538042613386322, 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 (16401809) 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, 745529 + ... + 745550.

It is an arithmetic number, because the mean of its divisors is an integer number (4473240).

Almost surely, 2^16401869 is an apocalyptic number.

It is an amenable number.

16401869 is a deficient number, since it is larger than the sum of its proper divisors (1491091).

16401869 is a wasteful number, since it uses less digits than its factorization.

16401869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491090.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 16401869 is about 4049.9220980162. The cubic root of 16401869 is about 254.0764696286.

The spelling of 16401869 in words is "sixteen million, four hundred one thousand, eight hundred sixty-nine".