774425021 has 4 divisors (see below), whose sum is σ = 819979452. Its totient is φ = 728870592.

The previous prime is 774424993. The next prime is 774425023. The reversal of 774425021 is 120524477.

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

It can be written as a sum of positive squares in 2 ways, for example, as 651525625 + 122899396 = 25525^2 + 11086^2 .

It is a cyclic number.

It is not a de Polignac number, because 774425021 - 2¹⁰ = 774423997 is a prime.

It is a super-2 number, since 2×774425021² = 1199468226301700882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (774425023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22777190 + ... + 22777223.

It is an arithmetic number, because the mean of its divisors is an integer number (204994863).

Almost surely, 2^774425021 is an apocalyptic number.

It is an amenable number.

774425021 is a deficient number, since it is larger than the sum of its proper divisors (45554431).

774425021 is a wasteful number, since it uses less digits than its factorization.

774425021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45554430.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 774425021 is about 27828.4929703353. The cubic root of 774425021 is about 918.3180599925.

Adding to 774425021 its reverse (120524477), we get a palindrome (894949498).

The spelling of 774425021 in words is "seven hundred seventy-four million, four hundred twenty-five thousand, twenty-one".