740066381 has 4 divisors (see below), whose sum is σ = 740443452. Its totient is φ = 739689312.

The previous prime is 740066357. The next prime is 740066387. The reversal of 740066381 is 183660047.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183660047 = 2879 ⋅63793.

It can be written as a sum of positive squares in 2 ways, for example, as 376554025 + 363512356 = 19405^2 + 19066^2 .

It is a cyclic number.

It is not a de Polignac number, because 740066381 - 2¹⁸ = 739804237 is a prime.

It is a super-2 number, since 2×740066381² = 1095396496572874322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (740066387) 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, 185576 + ... + 189521.

It is an arithmetic number, because the mean of its divisors is an integer number (185110863).

Almost surely, 2^740066381 is an apocalyptic number.

It is an amenable number.

740066381 is a deficient number, since it is larger than the sum of its proper divisors (377071).

740066381 is a wasteful number, since it uses less digits than its factorization.

740066381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377070.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 740066381 is about 27204.1610971557. The cubic root of 740066381 is about 904.5312147393.

The spelling of 740066381 in words is "seven hundred forty million, sixty-six thousand, three hundred eighty-one".