139680450 has 240 divisors, whose sum is σ = 478927680. Its totient is φ = 29393280.

The previous prime is 139680433. The next prime is 139680479. The reversal of 139680450 is 54086931.

139680450 = 2220² + 2221² + ... + 2247².

It is a super-2 number, since 2×139680450² = 39021256224405000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 368361 + ... + 368739.

It is an arithmetic number, because the mean of its divisors is an integer number (1995532).

Almost surely, 2^139680450 is an apocalyptic number.

139680450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139680450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239463840).

139680450 is an abundant number, since it is smaller than the sum of its proper divisors (339247230).

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

139680450 is a wasteful number, since it uses less digits than its factorization.

139680450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 139680450 is about 11818.6483998806. The cubic root of 139680450 is about 518.8540469673.

The spelling of 139680450 in words is "one hundred thirty-nine million, six hundred eighty thousand, four hundred fifty".