76400021 has 4 divisors (see below), whose sum is σ = 76560000. Its totient is φ = 76240044.

The previous prime is 76400017. The next prime is 76400053. The reversal of 76400021 is 12000467.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 76400021 - 2² = 76400017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 76399966 and 76400002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76400921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79271 + ... + 80228.

It is an arithmetic number, because the mean of its divisors is an integer number (19140000).

Almost surely, 2^76400021 is an apocalyptic number.

It is an amenable number.

76400021 is a deficient number, since it is larger than the sum of its proper divisors (159979).

76400021 is a wasteful number, since it uses less digits than its factorization.

76400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159978.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 76400021 is about 8740.7105546403. The cubic root of 76400021 is about 424.3242243152.

Adding to 76400021 its reverse (12000467), we get a palindrome (88400488).

The spelling of 76400021 in words is "seventy-six million, four hundred thousand, twenty-one".