51404042 has 4 divisors (see below), whose sum is σ = 77106066. Its totient is φ = 25702020.

The previous prime is 51403991. The next prime is 51404053. The reversal of 51404042 is 24040415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29604481 + 21799561 = 5441^2 + 4669^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12851009 + ... + 12851012.

Almost surely, 2^51404042 is an apocalyptic number.

51404042 is a deficient number, since it is larger than the sum of its proper divisors (25702024).

51404042 is a wasteful number, since it uses less digits than its factorization.

51404042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25702023.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 51404042 is about 7169.6612193325. The cubic root of 51404042 is about 371.8197232247.

Adding to 51404042 its reverse (24040415), we get a palindrome (75444457).

The spelling of 51404042 in words is "fifty-one million, four hundred four thousand, forty-two".