51692399 has 8 divisors (see below), whose sum is σ = 56640720. Its totient is φ = 46785600.

The previous prime is 51692383. The next prime is 51692401. The reversal of 51692399 is 99329615.

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

It is a cyclic number.

It is not a de Polignac number, because 51692399 - 2⁴ = 51692383 is a prime.

It is a super-2 number, since 2×51692399² = 5344208228750402, 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 (51692099) 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, 7742 + ... + 12779.

It is an arithmetic number, because the mean of its divisors is an integer number (7080090).

Almost surely, 2^51692399 is an apocalyptic number.

51692399 is a deficient number, since it is larger than the sum of its proper divisors (4948321).

51692399 is a wasteful number, since it uses less digits than its factorization.

51692399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20761.

The product of its digits is 131220, while the sum is 44.

The square root of 51692399 is about 7189.7426240443. The cubic root of 51692399 is about 372.5136826648.

The spelling of 51692399 in words is "fifty-one million, six hundred ninety-two thousand, three hundred ninety-nine".