139706477 has 4 divisors (see below), whose sum is σ = 140806656. Its totient is φ = 138606300.

The previous prime is 139706473. The next prime is 139706507. The reversal of 139706477 is 774607931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 774607931 = 907 ⋅854033.

It is a cyclic number.

It is not a de Polignac number, because 139706477 - 2² = 139706473 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139706473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549899 + ... + 550152.

It is an arithmetic number, because the mean of its divisors is an integer number (35201664).

Almost surely, 2^139706477 is an apocalyptic number.

It is an amenable number.

139706477 is a deficient number, since it is larger than the sum of its proper divisors (1100179).

139706477 is a wasteful number, since it uses less digits than its factorization.

139706477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100178.

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 139706477 is about 11819.7494474291. The cubic root of 139706477 is about 518.8862714139.

The spelling of 139706477 in words is "one hundred thirty-nine million, seven hundred six thousand, four hundred seventy-seven".