742631 has 4 divisors (see below), whose sum is σ = 744600. Its totient is φ = 740664.

The previous prime is 742619. The next prime is 742657. The reversal of 742631 is 136247.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-742631 is a prime.

It is a super-2 number, since 2×742631² = 1103001604322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 742597 and 742606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742681) 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, 221 + ... + 1238.

It is an arithmetic number, because the mean of its divisors is an integer number (186150).

2⁷⁴²⁶³¹ is an apocalyptic number.

742631 is a deficient number, since it is larger than the sum of its proper divisors (1969).

742631 is a wasteful number, since it uses less digits than its factorization.

742631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968.

The product of its digits is 1008, while the sum is 23.

The square root of 742631 is about 861.7604075380. The cubic root of 742631 is about 90.5574861409.

Adding to 742631 its reverse (136247), we get a palindrome (878878).

The spelling of 742631 in words is "seven hundred forty-two thousand, six hundred thirty-one".