402037491 has 4 divisors (see below), whose sum is σ = 536049992. Its totient is φ = 268024992.

The previous prime is 402037477. The next prime is 402037507. The reversal of 402037491 is 194730204.

It is a happy number.

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

It is not a de Polignac number, because 402037491 - 2¹⁷ = 401906419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402037451) 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, 67006246 + ... + 67006251.

It is an arithmetic number, because the mean of its divisors is an integer number (134012498).

Almost surely, 2^402037491 is an apocalyptic number.

402037491 is a deficient number, since it is larger than the sum of its proper divisors (134012501).

402037491 is a wasteful number, since it uses less digits than its factorization.

402037491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134012500.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 402037491 is about 20050.8725745290. The cubic root of 402037491 is about 738.0552117535.

Adding to 402037491 its reverse (194730204), we get a palindrome (596767695).

The spelling of 402037491 in words is "four hundred two million, thirty-seven thousand, four hundred ninety-one".