137977394 has 4 divisors (see below), whose sum is σ = 206966094. Its totient is φ = 68988696.

The previous prime is 137977349. The next prime is 137977397. The reversal of 137977394 is 493779731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493779731 = 1123 ⋅439697.

It can be written as a sum of positive squares in only one way, i.e., 126855169 + 11122225 = 11263^2 + 3335^2 .

It is a super-2 number, since 2×137977394² = 38075522510062472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (137977397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34494347 + ... + 34494350.

Almost surely, 2^137977394 is an apocalyptic number.

137977394 is a deficient number, since it is larger than the sum of its proper divisors (68988700).

137977394 is an equidigital number, since it uses as much as digits as its factorization.

137977394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68988699.

The product of its digits is 1000188, while the sum is 50.

The square root of 137977394 is about 11746.3779098069. The cubic root of 137977394 is about 516.7367063334.

The spelling of 137977394 in words is "one hundred thirty-seven million, nine hundred seventy-seven thousand, three hundred ninety-four".