402439061 has 4 divisors (see below), whose sum is σ = 416316300. Its totient is φ = 388561824.

The previous prime is 402439049. The next prime is 402439069. The reversal of 402439061 is 160934204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 331458436 + 70980625 = 18206^2 + 8425^2 .

It is a cyclic number.

It is not a de Polignac number, because 402439061 - 2¹⁰ = 402438037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 13877209 = 402439061 / (4 + 0 + 2 + 4 + 3 + 9 + 0 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402439069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6938576 + ... + 6938633.

It is an arithmetic number, because the mean of its divisors is an integer number (104079075).

Almost surely, 2^402439061 is an apocalyptic number.

402439061 is the 8972-nd centered decagonal number.

It is an amenable number.

402439061 is a deficient number, since it is larger than the sum of its proper divisors (13877239).

402439061 is a wasteful number, since it uses less digits than its factorization.

402439061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13877238.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 402439061 is about 20060.8838539083. The cubic root of 402439061 is about 738.3008623159.

The spelling of 402439061 in words is "four hundred two million, four hundred thirty-nine thousand, sixty-one".