51402406 has 8 divisors (see below), whose sum is σ = 84113064. Its totient is φ = 23364720.

The previous prime is 51402389. The next prime is 51402409. The reversal of 51402406 is 60420415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 2336473 = 51402406 / (5 + 1 + 4 + 0 + 2 + 4 + 0 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51402409) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1168215 + ... + 1168258.

It is an arithmetic number, because the mean of its divisors is an integer number (10514133).

Almost surely, 2^51402406 is an apocalyptic number.

51402406 is a deficient number, since it is larger than the sum of its proper divisors (32710658).

51402406 is a wasteful number, since it uses less digits than its factorization.

51402406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336486.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 51402406 is about 7169.5471265625. The cubic root of 51402406 is about 371.8157786353.

Subtracting 51402406 from its reverse (60420415), we obtain a square (9018009 = 3003²).

The spelling of 51402406 in words is "fifty-one million, four hundred two thousand, four hundred six".