742638 has 16 divisors (see below), whose sum is σ = 1599696. Its totient is φ = 228480.

The previous prime is 742619. The next prime is 742657. The reversal of 742638 is 836247.

It is an interprime number because it is at equal distance from previous prime (742619) and next prime (742657).

It is a super-2 number, since 2×742638² = 1103022398088, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 742638.

It is an unprimeable number.

742638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4683 + ... + 4838.

It is an arithmetic number, because the mean of its divisors is an integer number (99981).

2⁷⁴²⁶³⁸ is an apocalyptic number.

742638 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

742638 is an abundant number, since it is smaller than the sum of its proper divisors (857058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

742638 is a wasteful number, since it uses less digits than its factorization.

742638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9539.

The product of its digits is 8064, while the sum is 30.

The square root of 742638 is about 861.7644689821. The cubic root of 742638 is about 90.5577706700.

The spelling of 742638 in words is "seven hundred forty-two thousand, six hundred thirty-eight".