378542909 has 4 divisors (see below), whose sum is σ = 398466240. Its totient is φ = 358619580.

The previous prime is 378542869. The next prime is 378542911. The reversal of 378542909 is 909245873.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 909245873 = 59 ⋅15410947.

It is a cyclic number.

It is not a de Polignac number, because 378542909 - 2²⁴ = 361765693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378542959) 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, 9961637 + ... + 9961674.

It is an arithmetic number, because the mean of its divisors is an integer number (99616560).

Almost surely, 2^378542909 is an apocalyptic number.

It is an amenable number.

378542909 is a deficient number, since it is larger than the sum of its proper divisors (19923331).

378542909 is a wasteful number, since it uses less digits than its factorization.

378542909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19923330.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 378542909 is about 19456.1791983935. The cubic root of 378542909 is about 723.3886744853.

The spelling of 378542909 in words is "three hundred seventy-eight million, five hundred forty-two thousand, nine hundred nine".