187438331 has 4 divisors (see below), whose sum is σ = 188806632. Its totient is φ = 186070032.

The previous prime is 187438327. The next prime is 187438357. The reversal of 187438331 is 133834781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133834781 = 31 ⋅4317251.

It is a cyclic number.

It is not a de Polignac number, because 187438331 - 2² = 187438327 is a prime.

It is a super-2 number, since 2×187438331² = 70266255856131122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187438301) 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, 683945 + ... + 684218.

It is an arithmetic number, because the mean of its divisors is an integer number (47201658).

Almost surely, 2^187438331 is an apocalyptic number.

187438331 is a deficient number, since it is larger than the sum of its proper divisors (1368301).

187438331 is a wasteful number, since it uses less digits than its factorization.

187438331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368300.

The product of its digits is 48384, while the sum is 38.

The square root of 187438331 is about 13690.8119189477. The cubic root of 187438331 is about 572.2943647225.

The spelling of 187438331 in words is "one hundred eighty-seven million, four hundred thirty-eight thousand, three hundred thirty-one".