74801921 has 16 divisors (see below), whose sum is σ = 82079568. Its totient is φ = 67891200.

The previous prime is 74801899. The next prime is 74801929. The reversal of 74801921 is 12910847.

It can be written as a sum of positive squares in 8 ways, for example, as 3568321 + 71233600 = 1889^2 + 8440^2 .

It is not a de Polignac number, because 74801921 - 2²⁶ = 7693057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (74801929) 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 15 ways as a sum of consecutive naturals, for example, 54281 + ... + 55641.

It is an arithmetic number, because the mean of its divisors is an integer number (5129973).

Almost surely, 2^74801921 is an apocalyptic number.

It is an amenable number.

74801921 is a deficient number, since it is larger than the sum of its proper divisors (7277647).

74801921 is a wasteful number, since it uses less digits than its factorization.

74801921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 74801921 is about 8648.8103806246. The cubic root of 74801921 is about 421.3447468907.

The spelling of 74801921 in words is "seventy-four million, eight hundred one thousand, nine hundred twenty-one".