51183390 has 16 divisors (see below), whose sum is σ = 122840208. Its totient is φ = 13648896.

The previous prime is 51183383. The next prime is 51183401. The reversal of 51183390 is 9338115.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1706113 = 51183390 / (5 + 1 + 1 + 8 + 3 + 3 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853027 + ... + 853086.

It is an arithmetic number, because the mean of its divisors is an integer number (7677513).

Almost surely, 2^51183390 is an apocalyptic number.

51183390 is an abundant number, since it is smaller than the sum of its proper divisors (71656818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51183390 is a wasteful number, since it uses less digits than its factorization.

51183390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706123.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 51183390 is about 7154.2567748160. The cubic root of 51183390 is about 371.2869477676.

The spelling of 51183390 in words is "fifty-one million, one hundred eighty-three thousand, three hundred ninety".