15700997 has 4 divisors (see below), whose sum is σ = 16908780. Its totient is φ = 14493216.

The previous prime is 15700969. The next prime is 15700999. The reversal of 15700997 is 79900751.

15700997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8726116 + 6974881 = 2954^2 + 2641^2 .

It is a cyclic number.

It is not a de Polignac number, because 15700997 - 2⁶ = 15700933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15700997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15700999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 603872 + ... + 603897.

It is an arithmetic number, because the mean of its divisors is an integer number (4227195).

Almost surely, 2^15700997 is an apocalyptic number.

It is an amenable number.

15700997 is a deficient number, since it is larger than the sum of its proper divisors (1207783).

15700997 is a wasteful number, since it uses less digits than its factorization.

15700997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207782.

The product of its (nonzero) digits is 19845, while the sum is 38.

The square root of 15700997 is about 3962.4483592850. The cubic root of 15700997 is about 250.4046619747.

The spelling of 15700997 in words is "fifteen million, seven hundred thousand, nine hundred ninety-seven".