51287394 has 8 divisors (see below), whose sum is σ = 102574800. Its totient is φ = 17095796.

The previous prime is 51287377. The next prime is 51287429. The reversal of 51287394 is 49378215.

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

51287394 is an admirable number.

It is a super-2 number, since 2×51287394² = 5260793566622472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4273944 + ... + 4273955.

It is an arithmetic number, because the mean of its divisors is an integer number (12821850).

Almost surely, 2^51287394 is an apocalyptic number.

51287394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51287394 is a wasteful number, since it uses less digits than its factorization.

51287394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8547904.

The product of its digits is 60480, while the sum is 39.

The square root of 51287394 is about 7161.5217656585. The cubic root of 51287394 is about 371.5382610805.

It can be divided in two parts, 51287 and 394, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 51287394 in words is "fifty-one million, two hundred eighty-seven thousand, three hundred ninety-four".