402431421 has 8 divisors (see below), whose sum is σ = 613228864. Its totient is φ = 229960800.

The previous prime is 402431411. The next prime is 402431431. The reversal of 402431421 is 124134204.

It is an interprime number because it is at equal distance from previous prime (402431411) and next prime (402431431).

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

It is not a de Polignac number, because 402431421 - 2¹⁴ = 402415037 is a prime.

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: 19163401 = 402431421 / (4 + 0 + 2 + 4 + 3 + 1 + 4 + 2 + 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 (402431401) 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, 9581680 + ... + 9581721.

It is an arithmetic number, because the mean of its divisors is an integer number (76653608).

Almost surely, 2^402431421 is an apocalyptic number.

It is an amenable number.

402431421 is a deficient number, since it is larger than the sum of its proper divisors (210797443).

402431421 is a wasteful number, since it uses less digits than its factorization.

402431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19163411.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 402431421 is about 20060.6934326807. The cubic root of 402431421 is about 738.2961902593.

Adding to 402431421 its reverse (124134204), we get a palindrome (526565625).

The spelling of 402431421 in words is "four hundred two million, four hundred thirty-one thousand, four hundred twenty-one".