139420440 has 160 divisors (see below), whose sum is σ = 481686480. Its totient is φ = 36142848.

The previous prime is 139420433. The next prime is 139420447. The reversal of 139420440 is 44024931.

It is an interprime number because it is at equal distance from previous prime (139420433) and next prime (139420447).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139420447) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 119299 + ... + 120461.

Almost surely, 2^139420440 is an apocalyptic number.

139420440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139420440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240843240).

139420440 is an abundant number, since it is smaller than the sum of its proper divisors (342266040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139420440 is a wasteful number, since it uses less digits than its factorization.

139420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 139420440 is about 11807.6432872949. The cubic root of 139420440 is about 518.5319044491.

The spelling of 139420440 in words is "one hundred thirty-nine million, four hundred twenty thousand, four hundred forty".