2739370921 has 9 divisors (see below), whose sum is σ = 3187041399. Its totient is φ = 2347718184.

The previous prime is 2739370903. The next prime is 2739370937. The reversal of 2739370921 is 1290739372.

The square root of 2739370921 is 52339.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2621952025 + 117418896 = 51205^2 + 10836^2 .

It is not a de Polignac number, because 2739370921 - 2⁷ = 2739370793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2739370901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 362635 + ... + 370111.

It is an arithmetic number, because the mean of its divisors is an integer number (354115711).

Almost surely, 2^2739370921 is an apocalyptic number.

2739370921 is the 52339-th square number.

2739370921 is the 26170-th centered octagonal number.

It is an amenable number.

2739370921 is a deficient number, since it is larger than the sum of its proper divisors (447670478).

2739370921 is an frugal number, since it uses more digits than its factorization.

2739370921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14968 (or 7484 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 43.

The cubic root of 2739370921 is about 1399.2122985544.

Multiplying 2739370921 by its product of nonzero digits (142884), we get a square (391412274676164 = 19784142²).

The spelling of 2739370921 in words is "two billion, seven hundred thirty-nine million, three hundred seventy thousand, nine hundred twenty-one".