16219957 has 6 divisors (see below), whose sum is σ = 17483298. Its totient is φ = 14958864.

The previous prime is 16219933. The next prime is 16219981. The reversal of 16219957 is 75991261.

It is an interprime number because it is at equal distance from previous prime (16219933) and next prime (16219981).

It can be written as a sum of positive squares in 3 ways, for example, as 2187441 + 14032516 = 1479^2 + 3746^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16219957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16219927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13963 + ... + 15079.

It is an arithmetic number, because the mean of its divisors is an integer number (2913883).

Almost surely, 2^16219957 is an apocalyptic number.

It is an amenable number.

16219957 is a deficient number, since it is larger than the sum of its proper divisors (1263341).

16219957 is an frugal number, since it uses more digits than its factorization.

16219957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247 (or 1130 counting only the distinct ones).

The product of its digits is 34020, while the sum is 40.

The square root of 16219957 is about 4027.4007746933. The cubic root of 16219957 is about 253.1336605684.

The spelling of 16219957 in words is "sixteen million, two hundred nineteen thousand, nine hundred fifty-seven".