139280977 has 8 divisors (see below), whose sum is σ = 155649312. Its totient is φ = 123530400.

The previous prime is 139280971. The next prime is 139280993. The reversal of 139280977 is 779082931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139280977 - 2²³ = 130892369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139280971) 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, 153963 + ... + 154864.

It is an arithmetic number, because the mean of its divisors is an integer number (19456164).

Almost surely, 2^139280977 is an apocalyptic number.

It is an amenable number.

139280977 is a deficient number, since it is larger than the sum of its proper divisors (16368335).

139280977 is a wasteful number, since it uses less digits than its factorization.

139280977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308879.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 139280977 is about 11801.7361858330. The cubic root of 139280977 is about 518.3589500361.

It can be divided in two parts, 1392 and 80977, that added together give a square (82369 = 287²).

The spelling of 139280977 in words is "one hundred thirty-nine million, two hundred eighty thousand, nine hundred seventy-seven".