13999770 has 64 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 3535488.

The previous prime is 13999759. The next prime is 13999781. The reversal of 13999770 is 7799931.

It is an interprime number because it is at equal distance from previous prime (13999759) and next prime (13999781).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3766 + ... + 6494.

It is an arithmetic number, because the mean of its divisors is an integer number (614250).

Almost surely, 2^13999770 is an apocalyptic number.

13999770 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 13999770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19656000).

13999770 is an abundant number, since it is smaller than the sum of its proper divisors (25312230).

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

13999770 is a wasteful number, since it uses less digits than its factorization.

13999770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764 (or 2758 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 13999770 is about 3741.6266516049. The cubic root of 13999770 is about 241.0129065705.

The spelling of 13999770 in words is "thirteen million, nine hundred ninety-nine thousand, seven hundred seventy".