139691456 has 56 divisors (see below), whose sum is σ = 288462720. Its totient is φ = 67046400.

The previous prime is 139691423. The next prime is 139691471. The reversal of 139691456 is 654196931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358910 + ... + 359298.

It is an arithmetic number, because the mean of its divisors is an integer number (5151120).

Almost surely, 2^139691456 is an apocalyptic number.

139691456 is a gapful number since it is divisible by the number (16) 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 139691456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144231360).

139691456 is an abundant number, since it is smaller than the sum of its proper divisors (148771264).

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

139691456 is a wasteful number, since it uses less digits than its factorization.

139691456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613 (or 603 counting only the distinct ones).

The product of its digits is 174960, while the sum is 44.

The square root of 139691456 is about 11819.1140107878. The cubic root of 139691456 is about 518.8676741610.

The spelling of 139691456 in words is "one hundred thirty-nine million, six hundred ninety-one thousand, four hundred fifty-six".