401987493 has 12 divisors (see below), whose sum is σ = 594811308. Its totient is φ = 261455040.

The previous prime is 401987483. The next prime is 401987501. The reversal of 401987493 is 394789104.

401987493 is a `hidden beast` number, since 401 + 98 + 74 + 93 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 79174404 + 322813089 = 8898^2 + 17967^2 .

It is not a de Polignac number, because 401987493 - 2⁴ = 401987477 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401987483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 544330 + ... + 545067.

It is an arithmetic number, because the mean of its divisors is an integer number (49567609).

Almost surely, 2^401987493 is an apocalyptic number.

It is an amenable number.

401987493 is a deficient number, since it is larger than the sum of its proper divisors (192823815).

401987493 is a wasteful number, since it uses less digits than its factorization.

401987493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089444 (or 1089441 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 401987493 is about 20049.6257571058. The cubic root of 401987493 is about 738.0246152585.

The spelling of 401987493 in words is "four hundred one million, nine hundred eighty-seven thousand, four hundred ninety-three".