402002461 has 4 divisors (see below), whose sum is σ = 459431392. Its totient is φ = 344573532.

The previous prime is 402002453. The next prime is 402002543. The reversal of 402002461 is 164200204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402002461 - 2³ = 402002453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402002411) 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, 28714455 + ... + 28714468.

It is an arithmetic number, because the mean of its divisors is an integer number (114857848).

Almost surely, 2^402002461 is an apocalyptic number.

It is an amenable number.

402002461 is a deficient number, since it is larger than the sum of its proper divisors (57428931).

402002461 is an equidigital number, since it uses as much as digits as its factorization.

402002461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57428930.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 402002461 is about 20049.9990274314. Note that the first 3 decimals coincide. The cubic root of 402002461 is about 738.0337752577.

Adding to 402002461 its reverse (164200204), we get a palindrome (566202665).

The spelling of 402002461 in words is "four hundred two million, two thousand, four hundred sixty-one".