378906137 has 4 divisors (see below), whose sum is σ = 380314980. Its totient is φ = 377497296.

The previous prime is 378906131. The next prime is 378906181. The reversal of 378906137 is 731609873.

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

It can be written as a sum of positive squares in 2 ways, for example, as 204375616 + 174530521 = 14296^2 + 13211^2 .

It is a cyclic number.

It is not a de Polignac number, because 378906137 - 2⁸ = 378905881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378906131) 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, 704018 + ... + 704555.

It is an arithmetic number, because the mean of its divisors is an integer number (95078745).

Almost surely, 2^378906137 is an apocalyptic number.

It is an amenable number.

378906137 is a deficient number, since it is larger than the sum of its proper divisors (1408843).

378906137 is a wasteful number, since it uses less digits than its factorization.

378906137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408842.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 378906137 is about 19465.5114754275. The cubic root of 378906137 is about 723.6199745735.

The spelling of 378906137 in words is "three hundred seventy-eight million, nine hundred six thousand, one hundred thirty-seven".