402411261 has 8 divisors (see below), whose sum is σ = 613198144. Its totient is φ = 229949280.

The previous prime is 402411239. The next prime is 402411277. The reversal of 402411261 is 162114204.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402411261 - 2²² = 398216957 is a prime.

It is a super-2 number, since 2×402411261² = 323869645959220242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 19162441 = 402411261 / (4 + 0 + 2 + 4 + 1 + 1 + 2 + 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 (402411161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9581200 + ... + 9581241.

It is an arithmetic number, because the mean of its divisors is an integer number (76649768).

Almost surely, 2^402411261 is an apocalyptic number.

It is an amenable number.

402411261 is a deficient number, since it is larger than the sum of its proper divisors (210786883).

402411261 is a wasteful number, since it uses less digits than its factorization.

402411261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19162451.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 402411261 is about 20060.1909512347. The cubic root of 402411261 is about 738.2838616165.

Adding to 402411261 its reverse (162114204), we get a palindrome (564525465).

The spelling of 402411261 in words is "four hundred two million, four hundred eleven thousand, two hundred sixty-one".