139977394 has 12 divisors (see below), whose sum is σ = 212093694. Its totient is φ = 69281184.

The previous prime is 139977377. The next prime is 139977413. The reversal of 139977394 is 493779931.

It is a happy number.

139977394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 139358025 + 619369 = 11805^2 + 787^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177469 + ... + 178255.

Almost surely, 2^139977394 is an apocalyptic number.

139977394 is a deficient number, since it is larger than the sum of its proper divisors (72116300).

139977394 is an frugal number, since it uses more digits than its factorization.

139977394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689 (or 902 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 52.

The square root of 139977394 is about 11831.2042497795. The cubic root of 139977394 is about 519.2214606994.

The spelling of 139977394 in words is "one hundred thirty-nine million, nine hundred seventy-seven thousand, three hundred ninety-four".