137143978 has 16 divisors (see below), whose sum is σ = 212224680. Its totient is φ = 66419136.

The previous prime is 137143973. The next prime is 137143991. The reversal of 137143978 is 879341731.

It can be written as a sum of positive squares in 4 ways, for example, as 136585969 + 558009 = 11687^2 + 747^2 .

It is not an unprimeable number, because it can be changed into a prime (137143973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12900 + ... + 20992.

Almost surely, 2^137143978 is an apocalyptic number.

137143978 is a deficient number, since it is larger than the sum of its proper divisors (75080702).

137143978 is a wasteful number, since it uses less digits than its factorization.

137143978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8361.

The product of its digits is 127008, while the sum is 43.

The square root of 137143978 is about 11710.8487309844. The cubic root of 137143978 is about 515.6942006566.

The spelling of 137143978 in words is "one hundred thirty-seven million, one hundred forty-three thousand, nine hundred seventy-eight".