378947421 has 12 divisors (see below), whose sum is σ = 552213948. Its totient is φ = 250395264.

The previous prime is 378947411. The next prime is 378947423. The reversal of 378947421 is 124749873.

It can be written as a sum of positive squares in 2 ways, for example, as 20602521 + 358344900 = 4539^2 + 18930^2 .

It is not a de Polignac number, because 378947421 - 2⁵ = 378947389 is a prime.

It is a super-2 number, since 2×378947421² = 287202295765102482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378947423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185290 + ... + 187323.

It is an arithmetic number, because the mean of its divisors is an integer number (46017829).

Almost surely, 2^378947421 is an apocalyptic number.

It is an amenable number.

378947421 is a deficient number, since it is larger than the sum of its proper divisors (173266527).

378947421 is a wasteful number, since it uses less digits than its factorization.

378947421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372732 (or 372729 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 378947421 is about 19466.5718861848. The cubic root of 378947421 is about 723.6462544699.

The spelling of 378947421 in words is "three hundred seventy-eight million, nine hundred forty-seven thousand, four hundred twenty-one".