378221437 has 12 divisors (see below), whose sum is σ = 426972028. Its totient is φ = 334540800.

The previous prime is 378221419. The next prime is 378221449. The reversal of 378221437 is 734122873.

It can be written as a sum of positive squares in 2 ways, for example, as 164506276 + 213715161 = 12826^2 + 14619^2 .

It is not a de Polignac number, because 378221437 - 2²³ = 369832829 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 378221396 and 378221405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378221477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37764 + ... + 46717.

Almost surely, 2^378221437 is an apocalyptic number.

378221437 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

378221437 is a deficient number, since it is larger than the sum of its proper divisors (48750591).

378221437 is a wasteful number, since it uses less digits than its factorization.

378221437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84540 (or 84529 counting only the distinct ones).

The product of its digits is 56448, while the sum is 37.

The square root of 378221437 is about 19447.9160066060. The cubic root of 378221437 is about 723.1838407583.

378221437 divided by its sum of digits (37) gives a palindrome (10222201).

The spelling of 378221437 in words is "three hundred seventy-eight million, two hundred twenty-one thousand, four hundred thirty-seven".