51020406 has 12 divisors (see below), whose sum is σ = 110544252. Its totient is φ = 17006796.

The previous prime is 51020399. The next prime is 51020413. The reversal of 51020406 is 60402015.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51020399) and next prime (51020413).

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 2834467 = 51020406 / (5 + 1 + 0 + 2 + 0 + 4 + 0 + 6).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1417216 + ... + 1417251.

It is an arithmetic number, because the mean of its divisors is an integer number (9212021).

Almost surely, 2^51020406 is an apocalyptic number.

51020406 is an abundant number, since it is smaller than the sum of its proper divisors (59523846).

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

51020406 is a wasteful number, since it uses less digits than its factorization.

51020406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834475 (or 2834472 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51020406 is about 7142.8569914286. The cubic root of 51020406 is about 370.8924306046.

The spelling of 51020406 in words is "fifty-one million, twenty thousand, four hundred six".