51232340 has 24 divisors (see below), whose sum is σ = 107769480. Its totient is φ = 20458368.

The previous prime is 51232319. The next prime is 51232361. The reversal of 51232340 is 4323215.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51232319) and next prime (51232361).

It can be written as a sum of positive squares in 4 ways, for example, as 3511876 + 47720464 = 1874^2 + 6908^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 12374 + ... + 15986.

It is an arithmetic number, because the mean of its divisors is an integer number (4490395).

Almost surely, 2^51232340 is an apocalyptic number.

It is an amenable number.

51232340 is an abundant number, since it is smaller than the sum of its proper divisors (56537140).

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

51232340 is a wasteful number, since it uses less digits than its factorization.

51232340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331 (or 4329 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 51232340 is about 7157.6769974622. The cubic root of 51232340 is about 371.4052719958.

Adding to 51232340 its reverse (4323215), we get a palindrome (55555555).

The spelling of 51232340 in words is "fifty-one million, two hundred thirty-two thousand, three hundred forty".