402684489 has 9 divisors (see below), whose sum is σ = 581742343. Its totient is φ = 268416192.

The previous prime is 402684481. The next prime is 402684497. The reversal of 402684489 is 984486204.

The square root of 402684489 is 20067.

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

It is an interprime number because it is at equal distance from previous prime (402684481) and next prime (402684497).

It can be written as a sum of positive squares in only one way, i.e., 336098889 + 66585600 = 18333^2 + 8160^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 402684489 - 2³ = 402684481 is a prime.

It is a super-2 number, since 2×402684489² = 324309595362382242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402684481) 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, 56857 + ... + 63545.

Almost surely, 2^402684489 is an apocalyptic number.

402684489 is the 20067-th square number.

402684489 is the 10034-th centered octagonal number.

It is an amenable number.

402684489 is a deficient number, since it is larger than the sum of its proper divisors (179057854).

402684489 is an frugal number, since it uses more digits than its factorization.

402684489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13384 (or 6692 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The cubic root of 402684489 is about 738.4509164062.

The spelling of 402684489 in words is "four hundred two million, six hundred eighty-four thousand, four hundred eighty-nine".