378981731 has 4 divisors (see below), whose sum is σ = 401274792. Its totient is φ = 356688672.

The previous prime is 378981689. The next prime is 378981751. The reversal of 378981731 is 137189873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137189873 = 1471 ⋅93263.

It is a cyclic number.

It is not a de Polignac number, because 378981731 - 2⁶ = 378981667 is a prime.

It is a super-2 number, since 2×378981731² = 287254304863512722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378981751) 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, 11146505 + ... + 11146538.

It is an arithmetic number, because the mean of its divisors is an integer number (100318698).

Almost surely, 2^378981731 is an apocalyptic number.

378981731 is a deficient number, since it is larger than the sum of its proper divisors (22293061).

378981731 is a wasteful number, since it uses less digits than its factorization.

378981731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22293060.

The product of its digits is 254016, while the sum is 47.

The square root of 378981731 is about 19467.4531205291. The cubic root of 378981731 is about 723.6680935188.

The spelling of 378981731 in words is "three hundred seventy-eight million, nine hundred eighty-one thousand, seven hundred thirty-one".