402794584921 has 27 divisors (see below), whose sum is σ = 440195338359. Its totient is φ = 368489253888.

The previous prime is 402794584919. The next prime is 402794584931. The reversal of 402794584921 is 129485497204.

The square root of 402794584921 is 634661.

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

It can be written as a sum of positive squares in 13 ways, for example, as 21488334921 + 381306250000 = 146589^2 + 617500^2 .

It is not a de Polignac number, because 402794584921 - 2¹ = 402794584919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402794584931) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 399201265 + ... + 399202273.

Almost surely, 2^402794584921 is an apocalyptic number.

402794584921 is the 634661-st square number.

402794584921 is the 317331-st centered octagonal number.

It is an amenable number.

402794584921 is a deficient number, since it is larger than the sum of its proper divisors (37400753438).

402794584921 is an frugal number, since it uses more digits than its factorization.

402794584921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126 (or 1063 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 55.

It can be divided in two parts, 402794 and 584921, that added together give a triangular number (987715 = T₁₄₀₅).

The spelling of 402794584921 in words is "four hundred two billion, seven hundred ninety-four million, five hundred eighty-four thousand, nine hundred twenty-one".