139420749 has 16 divisors (see below), whose sum is σ = 204852032. Its totient is φ = 83801088.

The previous prime is 139420747. The next prime is 139420751. The reversal of 139420749 is 947024931.

It is an interprime number because it is at equal distance from previous prime (139420747) and next prime (139420751).

It is not a de Polignac number, because 139420749 - 2¹ = 139420747 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139420741) 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 in 15 ways as a sum of consecutive naturals, for example, 39892 + ... + 43245.

It is an arithmetic number, because the mean of its divisors is an integer number (12803252).

Almost surely, 2^139420749 is an apocalyptic number.

It is an amenable number.

139420749 is a deficient number, since it is larger than the sum of its proper divisors (65431283).

139420749 is a wasteful number, since it uses less digits than its factorization.

139420749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83196.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 139420749 is about 11807.6563720325. The cubic root of 139420749 is about 518.5322875260.

The spelling of 139420749 in words is "one hundred thirty-nine million, four hundred twenty thousand, seven hundred forty-nine".