137978444 has 6 divisors (see below), whose sum is σ = 241462284. Its totient is φ = 68989220.

The previous prime is 137978429. The next prime is 137978461. The reversal of 137978444 is 444879731.

It is a happy number.

137978444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×137978444² = 38076102017322272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17247302 + ... + 17247309.

It is an arithmetic number, because the mean of its divisors is an integer number (40243714).

Almost surely, 2^137978444 is an apocalyptic number.

It is an amenable number.

137978444 is a deficient number, since it is larger than the sum of its proper divisors (103483840).

137978444 is a wasteful number, since it uses less digits than its factorization.

137978444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34494615 (or 34494613 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 137978444 is about 11746.4226043507. The cubic root of 137978444 is about 516.7380171089.

The spelling of 137978444 in words is "one hundred thirty-seven million, nine hundred seventy-eight thousand, four hundred forty-four".