16997402 has 4 divisors (see below), whose sum is σ = 25496106. Its totient is φ = 8498700.

The previous prime is 16997401. The next prime is 16997413. The reversal of 16997402 is 20479961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20479961 = 1399 ⋅14639.

It can be written as a sum of positive squares in only one way, i.e., 16736281 + 261121 = 4091^2 + 511^2 .

It is not an unprimeable number, because it can be changed into a prime (16997401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4249349 + ... + 4249352.

Almost surely, 2^16997402 is an apocalyptic number.

16997402 is a deficient number, since it is larger than the sum of its proper divisors (8498704).

16997402 is an equidigital number, since it uses as much as digits as its factorization.

16997402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8498703.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 16997402 is about 4122.7905598029. The cubic root of 16997402 is about 257.1150599876.

The spelling of 16997402 in words is "sixteen million, nine hundred ninety-seven thousand, four hundred two".