51382390 has 32 divisors (see below), whose sum is σ = 94423680. Its totient is φ = 20127744.

The previous prime is 51382379. The next prime is 51382417. The reversal of 51382390 is 9328315.

It is a happy number.

It is a super-2 number, since 2×51382390² = 5280300004224200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152302 + ... + 152638.

It is an arithmetic number, because the mean of its divisors is an integer number (2950740).

Almost surely, 2^51382390 is an apocalyptic number.

51382390 is a deficient number, since it is larger than the sum of its proper divisors (43041290).

51382390 is a wasteful number, since it uses less digits than its factorization.

51382390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 51382390 is about 7168.1510865773. The cubic root of 51382390 is about 371.7675109152.

The spelling of 51382390 in words is "fifty-one million, three hundred eighty-two thousand, three hundred ninety".