18961375 has 16 divisors (see below), whose sum is σ = 25058592. Its totient is φ = 14275200.

The previous prime is 18961357. The next prime is 18961381. The reversal of 18961375 is 57316981.

It is not a de Polignac number, because 18961375 - 2⁷ = 18961247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2337 + ... + 6586.

It is an arithmetic number, because the mean of its divisors is an integer number (1566162).

Almost surely, 2^18961375 is an apocalyptic number.

18961375 is a deficient number, since it is larger than the sum of its proper divisors (6097217).

18961375 is an equidigital number, since it uses as much as digits as its factorization.

18961375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8955 (or 8945 counting only the distinct ones).

The product of its digits is 45360, while the sum is 40.

The square root of 18961375 is about 4354.4660981572. The cubic root of 18961375 is about 266.6592228825.

The spelling of 18961375 in words is "eighteen million, nine hundred sixty-one thousand, three hundred seventy-five".