51942440 has 32 divisors (see below), whose sum is σ = 127496160. Its totient is φ = 18888000.

The previous prime is 51942439. The next prime is 51942461. The reversal of 51942440 is 4424915.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

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, 58586 + ... + 59465.

It is an arithmetic number, because the mean of its divisors is an integer number (3984255).

Almost surely, 2^51942440 is an apocalyptic number.

It is an amenable number.

51942440 is an abundant number, since it is smaller than the sum of its proper divisors (75553720).

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

51942440 is a wasteful number, since it uses less digits than its factorization.

51942440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118073 (or 118069 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 51942440 is about 7207.1103779532. The cubic root of 51942440 is about 373.1133447441.

The spelling of 51942440 in words is "fifty-one million, nine hundred forty-two thousand, four hundred forty".