1021390654 has 16 divisors (see below), whose sum is σ = 1565475840. Its totient is φ = 499647960.

The previous prime is 1021390637. The next prime is 1021390691. The reversal of 1021390654 is 4560931201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4387 + ... + 45409.

It is an arithmetic number, because the mean of its divisors is an integer number (97842240).

Almost surely, 2^1021390654 is an apocalyptic number.

1021390654 is a deficient number, since it is larger than the sum of its proper divisors (544085186).

1021390654 is a wasteful number, since it uses less digits than its factorization.

1021390654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41295.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1021390654 is about 31959.2029625271. The cubic root of 1021390654 is about 1007.0799736758.

The spelling of 1021390654 in words is "one billion, twenty-one million, three hundred ninety thousand, six hundred fifty-four".