2156420349 has 6 divisors (see below), whose sum is σ = 3114829406. Its totient is φ = 1437613560.

The previous prime is 2156420341. The next prime is 2156420351. The reversal of 2156420349 is 9430246512.

It is a happy number.

2156420349 is a `hidden beast` number, since 2 + 1 + 5 + 642 + 0 + 3 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1294704324 + 861716025 = 35982^2 + 29355^2 .

It is not a de Polignac number, because 2156420349 - 2³ = 2156420341 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 (2156420341) 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, 119801122 + ... + 119801139.

Almost surely, 2^2156420349 is an apocalyptic number.

It is an amenable number.

2156420349 is a deficient number, since it is larger than the sum of its proper divisors (958409057).

2156420349 is a wasteful number, since it uses less digits than its factorization.

2156420349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239602267 (or 239602264 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2156420349 is about 46437.2732726632. The cubic root of 2156420349 is about 1291.9463336011.

The spelling of 2156420349 in words is "two billion, one hundred fifty-six million, four hundred twenty thousand, three hundred forty-nine".