51380439 has 16 divisors (see below), whose sum is σ = 74960640. Its totient is φ = 31045760.

The previous prime is 51380429. The next prime is 51380449. The reversal of 51380439 is 93408315.

It is an interprime number because it is at equal distance from previous prime (51380429) and next prime (51380449).

It is a cyclic number.

It is not a de Polignac number, because 51380439 - 2¹¹ = 51378391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51380429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9679 + ... + 14015.

It is an arithmetic number, because the mean of its divisors is an integer number (4685040).

Almost surely, 2^51380439 is an apocalyptic number.

51380439 is a deficient number, since it is larger than the sum of its proper divisors (23580201).

51380439 is a wasteful number, since it uses less digits than its factorization.

51380439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4710.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 51380439 is about 7168.0149971941. The cubic root of 51380439 is about 371.7628054925.

The spelling of 51380439 in words is "fifty-one million, three hundred eighty thousand, four hundred thirty-nine".