7640431 has 4 divisors (see below), whose sum is σ = 7650664. Its totient is φ = 7630200.

The previous prime is 7640419. The next prime is 7640443. The reversal of 7640431 is 1340467.

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

It is an interprime number because it is at equal distance from previous prime (7640419) and next prime (7640443).

It is a cyclic number.

It is not a de Polignac number, because 7640431 - 2¹¹ = 7638383 is a prime.

It is a super-2 number, since 2×7640431² = 116752371731522, 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 = 7640396 and 7640405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640411) 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, 3900 + ... + 5521.

It is an arithmetic number, because the mean of its divisors is an integer number (1912666).

Almost surely, 2^7640431 is an apocalyptic number.

7640431 is a deficient number, since it is larger than the sum of its proper divisors (10233).

7640431 is an equidigital number, since it uses as much as digits as its factorization.

7640431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 7640431 is about 2764.1329562812. The cubic root of 7640431 is about 196.9575436520.

Adding to 7640431 its reverse (1340467), we get a palindrome (8980898).

The spelling of 7640431 in words is "seven million, six hundred forty thousand, four hundred thirty-one".