746642821 has 4 divisors (see below), whose sum is σ = 749903500. Its totient is φ = 743382144.

The previous prime is 746642807. The next prime is 746642833. The reversal of 746642821 is 128246647.

It is a happy number.

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 713637796 + 33005025 = 26714^2 + 5745^2 .

It is a cyclic number.

It is not a de Polignac number, because 746642821 - 2¹⁷ = 746511749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (746642861) 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, 1629996 + ... + 1630453.

It is an arithmetic number, because the mean of its divisors is an integer number (187475875).

Almost surely, 2^746642821 is an apocalyptic number.

It is an amenable number.

746642821 is a deficient number, since it is larger than the sum of its proper divisors (3260679).

746642821 is a wasteful number, since it uses less digits than its factorization.

746642821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260678.

The product of its digits is 129024, while the sum is 40.

The square root of 746642821 is about 27324.7657080532. The cubic root of 746642821 is about 907.2026243986.

The spelling of 746642821 in words is "seven hundred forty-six million, six hundred forty-two thousand, eight hundred twenty-one".