76405421 has 8 divisors (see below), whose sum is σ = 79250688. Its totient is φ = 73584000.

The previous prime is 76405411. The next prime is 76405423. The reversal of 76405421 is 12450467.

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

It is a cyclic number.

It is not a de Polignac number, because 76405421 - 2¹⁰ = 76404397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76405423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701 + ... + 12381.

It is an arithmetic number, because the mean of its divisors is an integer number (9906336).

Almost surely, 2^76405421 is an apocalyptic number.

It is an amenable number.

76405421 is a deficient number, since it is larger than the sum of its proper divisors (2845267).

76405421 is a wasteful number, since it uses less digits than its factorization.

76405421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11923.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 76405421 is about 8741.0194485540. The cubic root of 76405421 is about 424.3342212446.

Adding to 76405421 its reverse (12450467), we get a palindrome (88855888).

The spelling of 76405421 in words is "seventy-six million, four hundred five thousand, four hundred twenty-one".