51920142 has 32 divisors (see below), whose sum is σ = 110709504. Its totient is φ = 16176000.

The previous prime is 51920119. The next prime is 51920149. The reversal of 51920142 is 24102915.

It is a super-2 number, since 2×51920142² = 5391402290600328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51920149) 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, 13717 + ... + 17087.

It is an arithmetic number, because the mean of its divisors is an integer number (3459672).

Almost surely, 2^51920142 is an apocalyptic number.

51920142 is an abundant number, since it is smaller than the sum of its proper divisors (58789362).

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

51920142 is a wasteful number, since it uses less digits than its factorization.

51920142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 51920142 is about 7205.5632673650. The cubic root of 51920142 is about 373.0599467126.

The spelling of 51920142 in words is "fifty-one million, nine hundred twenty thousand, one hundred forty-two".