51840415 has 16 divisors (see below), whose sum is σ = 68530176. Its totient is φ = 37332000.

The previous prime is 51840407. The next prime is 51840419. The reversal of 51840415 is 51404815.

It is not a de Polignac number, because 51840415 - 2³ = 51840407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51840419) 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, 1090 + ... + 10240.

It is an arithmetic number, because the mean of its divisors is an integer number (4283136).

Almost surely, 2^51840415 is an apocalyptic number.

51840415 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51840415 is a deficient number, since it is larger than the sum of its proper divisors (16689761).

51840415 is a wasteful number, since it uses less digits than its factorization.

51840415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9270.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 51840415 is about 7200.0288193868. The cubic root of 51840415 is about 372.8688956975.

Subtracting from 51840415 its reverse (51404815), we obtain a square (435600 = 660²).

The spelling of 51840415 in words is "fifty-one million, eight hundred forty thousand, four hundred fifteen".