7940155 has 4 divisors (see below), whose sum is σ = 9528192. Its totient is φ = 6352120.

The previous prime is 7940147. The next prime is 7940159. The reversal of 7940155 is 5510497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5510497 = 937 ⋅5881.

It is not a de Polignac number, because 7940155 - 2³ = 7940147 is a prime.

It is a super-2 number, since 2×7940155² = 126092122848050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

7940155 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7940159) 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, 794011 + ... + 794020.

It is an arithmetic number, because the mean of its divisors is an integer number (2382048).

Almost surely, 2^7940155 is an apocalyptic number.

7940155 is a deficient number, since it is larger than the sum of its proper divisors (1588037).

7940155 is a wasteful number, since it uses less digits than its factorization.

7940155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588036.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 7940155 is about 2817.8280643077. The cubic root of 7940155 is about 199.5000429227.

The spelling of 7940155 in words is "seven million, nine hundred forty thousand, one hundred fifty-five".