1540121770 has 16 divisors (see below), whose sum is σ = 3024239328. Its totient is φ = 560044240.

The previous prime is 1540121767. The next prime is 1540121789. The reversal of 1540121770 is 771210451.

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, 7000444 + ... + 7000663.

It is an arithmetic number, because the mean of its divisors is an integer number (189014958).

Almost surely, 2^1540121770 is an apocalyptic number.

1540121770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1540121770 is a deficient number, since it is larger than the sum of its proper divisors (1484117558).

1540121770 is a wasteful number, since it uses less digits than its factorization.

1540121770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14001125.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 1540121770 is about 39244.3852034912. The cubic root of 1540121770 is about 1154.8307867271.

The spelling of 1540121770 in words is "one billion, five hundred forty million, one hundred twenty-one thousand, seven hundred seventy".