1406897381 has 2 divisors, whose sum is σ = 1406897382. Its totient is φ = 1406897380.

The previous prime is 1406897341. The next prime is 1406897431. The reversal of 1406897381 is 1837986041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1105562500 + 301334881 = 33250^2 + 17359^2 .

It is a cyclic number.

It is not a de Polignac number, because 1406897381 - 2²² = 1402703077 is a prime.

It is a super-2 number, since 2×1406897381² = 3958720481329318322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1406897341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703448690 + 703448691.

It is an arithmetic number, because the mean of its divisors is an integer number (703448691).

Almost surely, 2^1406897381 is an apocalyptic number.

It is an amenable number.

1406897381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406897381 is an equidigital number, since it uses as much as digits as its factorization.

1406897381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 1406897381 is about 37508.6307534679. The cubic root of 1406897381 is about 1120.5230818218.

The spelling of 1406897381 in words is "one billion, four hundred six million, eight hundred ninety-seven thousand, three hundred eighty-one".